Ravenous (This creature enters the battlefield with X +1/+1 counters on it. If X is 5 or more, draw a card when it enters.)

Trample

Heavy Power Hammer — Whenever Aberrant deals combat damage to a player, destroy target artifact or enchantment that player controls.

Apocalypse Hydra enters the battlefield with X +1/+1 counters on it. If X is 5 or more, it enters the battlefield with an additional X +1/+1 counters on it.

, Remove a +1/+1 counter from Apocalypse Hydra: It deals 1 damage to any target.

Affinity for Food (This spell costs less to cast for each Food you control.)

Trample

Banquet Guests enters the battlefield with twice X +1/+1 counters on it.

, Sacrifice a Food: Banquet Guests gains indestructible until end of turn.

When Bladecoil Serpent enters the battlefield, for each spent to cast it, draw a card.

When Bladecoil Serpent enters the battlefield, for each spent to cast it, each opponent discards a card.

When Bladecoil Serpent enters the battlefield, for each spent to cast it, it gets +1/+0 and gains trample and haste until end of turn.

Capricopian enters the battlefield with X +1/+1 counters on it.

: Put a +1/+1 counter on Capricopian, then you may reselect which player Capricopian is attacking. Only the player Capricopian is attacking may activate this ability and only during the declare attackers step. (It can't attack its controller.)

Clay Champion enters the battlefield with three +1/+1 counters on it for each spent to cast it.

When Clay Champion enters the battlefield, choose up to two other target creatures you control. For each spent to cast Clay Champion, put a +1/+1 counter on each of them.

Cryptic Trilobite enters the battlefield with X +1/+1 counters on it.

Remove a +1/+1 counter from Cryptic Trilobite: Add . Spend this mana only to activate abilities.

, : Put a +1/+1 counter on Cryptic Trilobite.

Endless One enters the battlefield with X +1/+1 counters on it.

When Farmer Cotton enters the battlefield, create X 1/1 white Halfling creature tokens and X Food tokens. (They're artifacts with ", , Sacrifice this artifact: You gain 3 life.")

Investigate X times. (Then exile this card. You may cast the creature later from exile.)

When Gadwick, the Wizened enters the battlefield, draw X cards.

Whenever you cast a blue spell, tap target nonland permanent an opponent controls.

Vigilance, trample, haste

Goldvein Hydra enters the battlefield with X +1/+1 counters on it.

When Goldvein Hydra dies, create a number of tapped Treasure tokens equal to its power.

Distribute X +1/+1 counters among any number of target creatures you control. (Then exile this card. You may cast the creature later from exile.)

Haldir, Lórien Lieutenant enters the battlefield with X +1/+1 counters on it.

Vigilance

: Until end of turn, other Elves you control gain vigilance and get +1/+1 for each +1/+1 counter on Haldir.

Hooded Hydra enters the battlefield with X +1/+1 counters on it.

When Hooded Hydra dies, create a 1/1 green Snake creature token for each +1/+1 counter on it.

Morph

As Hooded Hydra is turned face up, put five +1/+1 counters on it.

Hungering Hydra enters the battlefield with X +1/+1 counters on it.

Hungering Hydra can't be blocked by more than one creature.

Whenever Hungering Hydra is dealt damage, put that many +1/+1 counters on it. (It must survive the damage to get the counters.)

When you cast this spell, you gain half X life and draw half X cards. Round down each time.

Flying, trample

Hydroid Krasis enters the battlefield with X +1/+1 counters on it.

Skulk (This creature can't be blocked by creatures with greater power.)

Ingenious Prodigy enters the battlefield with X +1/+1 counters on it.

At the beginning of your upkeep, if Ingenious Prodigy has one or more +1/+1 counters on it, you may remove a +1/+1 counter from it. If you do, draw a card.

When Jadelight Spelunker enters the battlefield, it explores X times. (To have it explore, reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on that creature, then put the card back or put it into your graveyard.)

Knickknack Ouphe enters the battlefield with X +1/+1 counters on it.

When Knickknack Ouphe enters the battlefield, reveal the top X cards of your library. You may put any number of Aura cards with mana value X or less from among them onto the battlefield. Then put all cards revealed this way that weren't put onto the battlefield on the bottom of your library in a random order.

Kurbis, Harvest Celebrant enters the battlefield with a number of +1/+1 counters on it equal to the amount of mana spent to cast it.

Remove a +1/+1 counter from Kurbis: Prevent all damage that would be dealt this turn to another target creature with a +1/+1 counter on it.

Trample, haste

Lightning Serpent enters the battlefield with X +1/+0 counters on it.

At the beginning of the end step, sacrifice Lightning Serpent.

Magma Pummeler enters the battlefield with X +1/+1 counters on it.

If damage would be dealt to Magma Pummeler while it has a +1/+1 counter on it, prevent that damage and remove that many +1/+1 counters from it. When one or more counters are removed from Magma Pummeler this way, it deals that much damage to any target.

Mikaeus, the Lunarch enters the battlefield with X +1/+1 counters on it.

: Put a +1/+1 counter on Mikaeus.

, Remove a +1/+1 counter from Mikaeus: Put a +1/+1 counter on each other creature you control.

As Neverwinter Hydra enters the battlefield, roll X d6. It enters with a number of +1/+1 counters on it equal to the total of those results.

Trample

Ward (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays .)

Trample

Ochre Jelly enters the battlefield with X +1/+1 counters on it.

Split — When Ochre Jelly dies, if it had two or more +1/+1 counters on it, create a token that's a copy of it at the beginning of the next end step. The token enters the battlefield with half that many +1/+1 counters on it, rounded down.

When you cast this spell, reveal cards from the top of your library until you reveal X creature cards. Put all creature cards revealed this way into your graveyard, then put the rest on the bottom of your library in a random order.

Old Stickfingers's power and toughness are each equal to the number of creature cards in your graveyard.

Flying, trample

When Orcus, Prince of Undeath enters the battlefield, choose one —

• Each other creature gets -X/-X until end of turn. You lose X life.

• Return up to X target creature cards with total mana value X or less from your graveyard to the battlefield. They gain haste until end of turn.

Tap X target creatures. They don't untap during their controllers' next untap steps. (Then exile this card. You may cast the creature later from exile.)

When Progenitor Exarch enters the battlefield, incubate 3 X times. (To incubate 3, create an Incubator token with three +1/+1 counters on it and ": Transform this artifact." It transforms into a 0/0 Phyrexian artifact creature.)

: Transform target Incubator token you control.

Vigilance, trample

Rampaging Yao Guai enters the battlefield with X +1/+1 counters on it.

When Rampaging Yao Guai enters the battlefield, destroy any number of target artifacts and/or enchantments with total mana value X or less.

When Rocco, Cabaretti Caterer enters the battlefield, if you cast it, you may search your library for a creature card with mana value X or less, put it onto the battlefield, then shuffle.

Double strike

Savageborn Hydra enters the battlefield with X +1/+1 counters on it.

: Put a +1/+1 counter on Savageborn Hydra. Activate only as a sorcery.

Flying, haste

Shivan Devastator enters the battlefield with X +1/+1 counters on it.

Ravenous (This creature enters the battlefield with X +1/+1 counters on it. If X is 5 or more, draw a card when it enters.)

Defender

Spore Chimney — When Sporocyst enters the battlefield, search your library for up to X basic land cards, put them onto the battlefield tapped, then shuffle.

Reach, trample, protection from multicolored

Stonecoil Serpent enters the battlefield with X +1/+1 counters on it.

Ravenous (This creature enters the battlefield with X +1/+1 counters on it. If X is 5 or more, draw a card when it enters.)

Death Frenzy — When Termagant Swarm dies, create a number of 1/1 green Tyranid creature tokens equal to Termagant Swarm's power.

When The Cyber-Controller enters the battlefield, each opponent mills X cards. Put all creature cards milled this way onto the battlefield face down under your control. They're 2/2 Cyberman artifact creatures.

Other artifact creatures you control get +1/+1.

Ravenous (This creature enters the battlefield with X +1/+1 counters on it. If X is 5 or more, draw a card when it enters.)

Shieldwall — Sacrifice Tyrant Guard: Creatures you control with counters on them gain hexproof and indestructible until end of turn.

Vastwood Hydra enters the battlefield with X +1/+1 counters on it.

When Vastwood Hydra dies, you may distribute a number of +1/+1 counters equal to the number of +1/+1 counters on Vastwood Hydra among any number of creatures you control.

Trample

Voracious Hydra enters the battlefield with X +1/+1 counters on it.

When Voracious Hydra enters the battlefield, choose one —

• Double the number of +1/+1 counters on Voracious Hydra.

• Voracious Hydra fights target creature you don't control.

Walking Ballista enters the battlefield with X +1/+1 counters on it.

: Put a +1/+1 counter on Walking Ballista.

Remove a +1/+1 counter from Walking Ballista: It deals 1 damage to any target.

Wildwood Scourge enters the battlefield with X +1/+1 counters on it.

Whenever one or more +1/+1 counters are put on another non-Hydra creature you control, put a +1/+1 counter on Wildwood Scourge.

Reach

Wren's Run Hydra enters the battlefield with X +1/+1 counters on it.

Reinforce X— (, Discard this card: Put X +1/+1 counters on target creature.)