Each creature spell you cast costs less to cast if it has mutate.

Whenever you cast a creature spell, if it has mutate, draw a card, then discard a card.

Reach, lifelink

Whenever Polukranos, Engine of Ruin or another nontoken Hydra you control dies, create a 3/3 green and white Phyrexian Hydra creature token with reach and a 3/3 green and white Phyrexian Hydra creature token with lifelink.

: Monstrosity X. (If this creature isn't monstrous, put X +1/+1 counters on it and it becomes monstrous.)

When Polukranos, World Eater becomes monstrous, it deals X damage divided as you choose among any number of target creatures your opponents control. Each of those creatures deals damage equal to its power to Polukranos.

When Polygraph Orb enters, look at the top four cards of your library. Put two of them into your hand and the rest into your graveyard. You lose 2 life.

, , Collect evidence 3: Each opponent loses 3 life unless they discard a card or sacrifice a creature. (To collect evidence 3, exile cards with total mana value 3 or greater from your graveyard.)

Until end of turn, each creature target player controls loses all abilities and becomes a blue Frog with base power and toughness 1/1.

Enrage — Whenever Polyraptor is dealt damage, create a token that's a copy of Polyraptor.

Enchant land

Whenever enchanted land becomes tapped, its controller loses 2 life.

: Destroy enchanted land.

When Portable Hole enters, exile target nonland permanent an opponent controls with mana value 2 or less until Portable Hole leaves the battlefield.

When Precursor Golem enters, create two 3/3 colorless Golem artifact creature tokens.

Whenever a player casts an instant or sorcery spell that targets only a single Golem, that player copies that spell for each other Golem that spell could target. Each copy targets a different one of those Golems.

When Professor of Symbology enters, 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.)

Prophetic Bolt deals 4 damage to any target. Look at the top four cards of your library. Put one of those cards into your hand and the rest on the bottom of your library in any order.

Provoke the Trolls deals 3 damage to any target. If a creature is dealt damage this way, it gets +5/+0 until end of turn.

Puncture Bolt deals 1 damage to target creature. Put a -1/-1 counter on that creature.

Whenever Pyreheart Wolf attacks, creatures you control gain menace until end of turn. (They can't be blocked except by two or more creatures.)

Undying (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.)

Landfall — Whenever a land you control enters, put a quest counter on Quest for the Necropolis.

, Sacrifice Quest for the Necropolis: Put target creature card from a graveyard onto the battlefield under your control. This ability costs less to activate for each quest counter on Quest for the Necropolis. Activate only as a sorcery.

: Quilled Wolf gets +4/+4 until end of turn.

Instant and sorcery spells you control have lifelink.

At the beginning of your upkeep, exile an instant or sorcery card at random from your graveyard. You may cast it this turn. If a spell cast this way would be put into your graveyard, exile it instead.

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

If Rakavolver was kicked with its kicker, it enters with two +1/+1 counters on it and with "Whenever Rakavolver deals damage, you gain that much life."

If Rakavolver was kicked with its kicker, it enters with a +1/+1 counter on it and with flying.

At the beginning of each upkeep, if a player cast two or more spells last turn, transform Rampaging Werewolf.

Rat Colony gets +1/+0 for each other Rat you control.

A deck can have any number of cards named Rat Colony.

Destroy target enchantment. You gain 3 life.

, : Return target creature with a counter on it to its owner's hand.

Whenever Reckless Pangolin attacks, it gets +1/+1 until end of turn.

Return target card from your graveyard to your hand.

: Add one mana of any type that a land you control could produce.

Replicate—Pay . (When you cast this spell, copy it for each time you paid its replicate cost. You may choose new targets for the copies.)

Reiterating Bolt deals 3 damage to target creature or planeswalker.

Survival — At the beginning of your second main phase, if Reluctant Role Model is tapped, put a flying, lifelink, or +1/+1 counter on it.

Whenever Reluctant Role Model or another creature you control dies, if it had counters on it, put those counters on up to one target creature.

This spell can't be countered.

Rending Volley deals 4 damage to target white or blue creature.

Rally — Whenever Resolute Blademaster or another Ally you control enters, creatures you control gain double strike until end of turn.

: Resolute Rider gains lifelink until end of turn.

: Resolute Rider gains indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.)

You may exert Resolute Survivors as it attacks. (It won't untap during your next untap step.)

Whenever you exert a creature, Resolute Survivors deals 1 damage to each opponent and you gain 1 life.

Defender

, Sacrifice Resolute Watchdog: Target creature you control gains indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.)

Choose one —

• Counter all other spells.

• Switch each creature's power and toughness until end of turn.

• Creatures can't be blocked this turn.

When Revolutionist enters, return target instant or sorcery card from your graveyard to your hand.

Madness (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

Battle cry (Whenever this creature attacks, each other attacking creature gets +1/+0 until end of turn.)

At the beginning of combat on your turn, the next time target creature would deal combat damage to one or more players this combat, prevent that damage. If damage is prevented this way, create that many 1/1 colorless Phyrexian Mite artifact creature tokens with toxic 1 and "This creature can't block."

You gain 1 life for each creature your opponents control. Prevent all damage that would be dealt to you this turn.

, Sacrifice Riptide Chronologist: Untap all creatures of the creature type of your choice.

: River Merfolk gains mountainwalk until end of turn. (It can't be blocked as long as defending player controls a Mountain.)

Exchange control of two target permanents that share a permanent type.

Visit — Creatures you control get +2/+0 until end of turn.

Lights — 3, 6

Visit — Creatures you control get +2/+0 until end of turn.

Lights — 5, 6

Rolling Earthquake deals X damage to each creature without horsemanship and each player.

Destroy target land. If was spent to cast this spell, all creatures get -1/-1 until end of turn.

Rolling Temblor deals 2 damage to each creature without flying.

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

Whenever you cast an instant or sorcery spell, each opponent loses 1 life.

You may cast Rona, Sheoldred's Faithful from your graveyard by discarding two cards in addition to paying its other costs.

When Rooting Moloch enters, exile target card with a cycling ability from your graveyard. Until the end of your next turn, you may play that card.

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

Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)

Whenever a creature dealt damage by Rot Wolf this turn dies, you may draw a card.

Instant and sorcery spells you cast cost less to cast.

+1: Rowan, Scholar of Sparks deals 1 damage to each opponent. If you've drawn three or more cards this turn, she deals 3 damage to each opponent instead.

−4: You get an emblem with "Whenever you cast an instant or sorcery spell, you may pay . If you do, copy that spell. You may choose new targets for the copy."