Target player discards a card, then mills a card.

When Hostile Investigator enters, target opponent discards a card.

Whenever one or more players discard one or more cards, investigate. This ability triggers only once each turn. (Create a Clue token. It's an artifact with ", Sacrifice this artifact: Draw a card.")

Enchant land you control

Enchanted land has ": Prevent the next 1 damage that would be dealt to any target this turn."

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color.)

Destroy all nontoken creatures.

Creatures with power less than Howling Chorus's power can't block it.

Whenever Howling Chorus deals combat damage to a player, create a 3/2 colorless Eldrazi Horror creature token.

Howling Gale deals 1 damage to each creature with flying and each player.

Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Reach (This creature can block creatures with flying.)

When Howling Giant enters, create two 2/2 green Wolf creature tokens.

At the beginning of each player's draw step, if Howling Mine is untapped, that player draws an additional card.

When Howling Wolf enters, you may search your library for up to three cards named Howling Wolf, reveal them, put them into your hand, then shuffle.

Target creature you control gets +1/+0 until end of turn. It deals damage equal to its power to target creature an opponent controls.

Haste

You may have Hulking Metamorph enter as a copy of an artifact or creature you control, except it's an artifact creature in addition to its other types, and its power and toughness are equal to Hulking Metamorph's power and toughness.

//PRT-Prototype_Mech//

Prototype (You may cast this spell with different mana cost, color, and size. It keeps its abilities and types.)

3/3

Ward

At the beginning of your first main phase, add .

Rampage 1 <I>(Whenever this creature becomes blocked, it gets +1/+1 until end of turn for each creature blocking it beyond the first.)</I>

As long as you control a green or blue permanent, you may cast Hungering Yeti as though it had flash. (You may cast it any time you could cast an instant.)

Whenever Hunting Cheetah deals damage to an opponent, you may search your library for a Forest card, reveal that card, put it into your hand, then shuffle.

Threshold — As long as seven or more cards are in your graveyard, Hunting Grounds has "Whenever an opponent casts a spell, you may put a creature card from your hand onto the battlefield."

Echo (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)

When Hunting Moa enters or dies, put a +1/+1 counter on target creature.

Create three 1/1 green Elf Warrior creature tokens.

Reinforce 3— (, Discard this card: Put three +1/+1 counters on target creature.)

Kicker (You may pay an additional as you cast this spell.)

Search your library for up to two Forest cards, put them onto the battlefield tapped, then shuffle.

If this spell was kicked, untap all Forests put onto the battlefield this way. They become 3/3 green creatures with haste that are still lands.

Counter target artifact or creature spell. Discover X, where X is that spell's mana value. (Exile cards from the top of your library until you exile a nonland card with that mana value or less. Cast it without paying its mana cost or put it into your hand. Put the rest on the bottom in a random order.)

Flying, lifelink

Creatures entering or dying don't cause abilities to trigger.

You may exert Hydra Trainer as it attacks. When you do, target creature gets +X/+X until end of turn, where X is the number of counters on permanents you control. (An exerted creature won't untap during your next untap step.)

: Adapt 2. (If this creature has no +1/+1 counters on it, put two +1/+1 counters on it.)

Creatures your opponents control get -4/-0 until end of turn.

: Icatian Infantry gains first strike until end of turn.

: Icatian Infantry gains banding until end of turn. (Any creatures with banding, and up to one without, can attack in a band. Bands are blocked as a group. If any creatures with banding you control are blocking or being blocked by a creature, you divide that creature's combat damage, not its controller, among any of the creatures it's being blocked by or is blocking.)

, : Tap target artifact or creature. ( can be paid with one mana from a snow source.)

Protection Fighting Style — When Icewind Stalwart enters, exile up to one target non-Warrior creature you control, then return it to the battlefield under its owner's control.

When Ichor Wellspring enters or is put into a graveyard from the battlefield, draw a card.

Flying, vigilance

When Icingdeath, Frost Tyrant dies, create Icingdeath, Frost Tongue, a legendary white Equipment artifact token with "Equipped creature gets +2/+0," "Whenever equipped creature attacks, tap target creature defending player controls," and equip .

Igneous Inspiration deals 3 damage to any target.

Learn. (You may reveal a Lesson card you own from outside the game and put it into your hand, or discard a card to draw a card.)

At the beginning of your upkeep, Ill-Gotten Inheritance deals 1 damage to each opponent and you gain 1 life.

, Sacrifice Ill-Gotten Inheritance: It deals 4 damage to target opponent and you gain 4 life.

Kicker and/or (You may pay an additional and/or as you cast this spell.)

Illuminate deals X damage to target creature. If this spell was kicked with its kicker, it deals X damage to that creature's controller. If this spell was kicked with its kicker, you draw X cards.

, , Reveal two cards from your hand that share a color: Draw a card.

Counter target artifact or enchantment spell. Its controller gains life equal to its mana value.

Secrets of the Soul — , Sacrifice another creature: Add an amount of equal to the sacrificed creature's mana value.

Cumulative upkeep (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)

As Illusionary Terrain enters, choose two basic land types.

Basic lands of the first chosen type are the second chosen type.

Enchant creature

Enchanted creature has base power and toughness 0/2.

At the beginning of your upkeep, if you have a card in hand, return Imaginary Pet to its owner's hand.

Imminent Doom enters with a doom counter on it.

Whenever you cast a spell with mana value equal to the number of doom counters on Imminent Doom, Imminent Doom deals that much damage to any target. Then put a doom counter on Imminent Doom.

Destroy target attacking creature.

: Immolating Souleater gets +1/+0 until end of turn. ( can be paid with either or 2 life.)

Impeccable Timing deals 3 damage to target attacking or blocking creature.

Enchant creature

Enchanted creature gets +3/+3 and attacks each combat if able.

When enchanted creature dies, Impending Doom deals 3 damage to that creature's controller.

Soulbond (You may pair this creature with another unpaired creature when either enters. They remain paired for as long as you control both of them.)

As long as Imperious Mindbreaker is paired with another creature, each of those creatures has "Whenever this creature attacks, each opponent mills cards equal to its toughness."

Each player may discard their hand and draw cards equal to the greatest mana value of a commander they own on the battlefield or in the command zone.

Vigilance

Cycling (, Discard this card: Draw a card.)

Impossible Inferno deals 6 damage to target creature.

Delirium — If there are four or more card types among cards in your graveyard, exile the top card of your library. You may play it until the end of your next turn.

Enchant creature, land, or planeswalker

Enchanted permanent is a colorless land with ": Add " and loses all other card types and abilities.

Destroy all creatures you don't control and all planeswalkers you don't control.