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As an additional cost to cast this spell, sacrifice a creature. Add an amount of {B} equal to the sacrificed creature's mana value.

You may return three Islands you control to their owner's hand rather than pay this spell's mana cost. Counter target spell.

If you control a Swamp, you may pay 4 life rather than pay this spell's mana cost. Destroy target nonblack creature. It can't be regenerated.

You may exile a white card from your hand rather than pay this spell's mana cost. Choose a color. All creatures gain protection from the chosen col...

If you control a Plains, you may tap an untapped creature you control rather than pay this spell's mana cost. Creatures you control get +1/+1 until...

Flip a coin. If you win the flip, destroy all creatures with power 2 or less. If you lose the flip, destroy all creatures with power 3 or greater.

All lands become 2/2 creatures until end of turn. They're still lands.

Target player skips their next combat phase this turn.

You may exile a blue card from your hand rather than pay this spell's mana cost. Change the target of target spell with a single target.

If you control a Forest, rather than pay this spell's mana cost, you may have an opponent gain 3 life. Target creature gets +4/+4 until end of turn.

Exile all creature cards from all graveyards. You gain 1 life for each card exiled this way.

Add {B}{B}{B}.

Counter target spell.

Choose a card type. Target opponent reveals their hand. Blood Oath deals 3 damage to that player for each card of the chosen type revealed this way...

If you've cast another white spell this turn, you may cast this spell without paying its mana cost. Destroy all enchantments.

Delve (Each card you exile from your graveyard while casting this spell pays for {1}.) Counter target spell unless its controller pays {X}.

Counter target artifact, creature, or planeswalker spell. Its controller creates a 2/2 blue Bird creature token with flying.

Counter target artifact, creature, or planeswalker spell. Its controller creates a 2/2 blue Bird creature token with flying.

Choose two — • Target player creates X 0/1 colorless Eldrazi Spawn creature tokens with "Sacrifice this token: Add {C}." • Target player scries X, ...

Choose two — • Target player creates X 0/1 colorless Eldrazi Spawn creature tokens with "Sacrifice this token: Add {C}." • Target player scries X, ...

Choose two — • Target player creates two tapped 1/1 green Squirrel creature tokens. • Counter target loyalty ability of a planeswalker. • Exile tar...

Exile target creature and put two time counters on it. If it doesn't have suspend, it gains suspend. (At the beginning of its owner's upkeep, they ...

Gain control of target spell that targets only a single permanent or player. Copy it, then reselect the targets at random for the spell and the cop...

Reveal cards from the top of your library until you reveal a nonland card. Put the revealed cards on the bottom of your library in a random order. ...