If three or more creatures are attacking, you may pay rather than pay this spell's mana cost.

Attacking creatures get -3/-0 until end of turn.

If an opponent searched their library this turn, you may pay rather than pay this spell's mana cost.

Target opponent mills thirteen cards.

If an opponent had two or more creatures enter the battlefield under their control this turn, you may pay rather than pay this spell's mana cost.

Return two target creatures to their owners' hands.

Raid — If you attacked this turn, you may pay rather than pay this spell's mana cost.

Counter target spell.

This spell costs less to cast if an opponent cast two or more spells this turn.

Counter target spell.

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

Counter target spell.

You may discard an Island card and another card rather than pay this spell's mana cost.

Counter target spell.

If an opponent had a green creature enter the battlefield under their control this turn, you may pay rather than pay this spell's mana cost.

Tap up to two target creatures. Those creatures don't untap during their controller's next untap step.

You may pay 1 life and exile a blue card from your hand rather than pay this spell's mana cost.

Counter target spell.

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 an opponent controls a Forest and you control an Island, you may cast this spell without paying its mana cost.

Put target creature on top of its owner's library.

Converge — Creatures your opponents control get -X/-0 until end of turn, where X is the number of colors of mana spent to cast this spell.

Draw a card.

You may sacrifice a nontoken blue creature rather than pay this spell's mana cost.

Counter target spell.

If it's not your turn, you may exile a blue card from your hand rather than pay this spell's mana cost.

Counter target noncreature spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard.

This spell costs less to cast if it targets a green permanent.

Return target nonland permanent an opponent controls to its owner's hand.

Draw a card.

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

Tap all creatures.

Exile target nonland card in a graveyard that was put there from anywhere this turn. Copy it. You may cast the copy without paying its mana cost.

Return target spell or nonland permanent an opponent controls to its owner's hand. You may cast an instant or sorcery spell with equal or lesser mana value from your hand without paying its mana cost.