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Equipped creature gets +1/+2.
Whenever you draw your second card each turn, attach Mantle of Tides to target creature you control.
Equip {3} ({3}: Attach to target creature you control. Equip only as a sorcery.)

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Target player puts the top four cards of their library into their graveyard. (Then exile this card. You may cast the creature later from exile.)

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When Witching Well enters the battlefield, scry 2. (Look at the top two cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.)
{3}{U}, Sacrifice Witching…

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Defender
{1}{U}: Wishful Merfolk loses defender and becomes a Human until end of turn.

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({T}: Add {U}.)
Mystic Sanctuary enters the battlefield tapped unless you control three or more other Islands.
When Mystic Sanctuary enters the battlefield untapped, you may put target instant or sorcery card from your…

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Whenever Queen of Ice deals combat damage to a creature, tap that creature. It doesn't untap during its controller's next untap step.

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Tap target creature. It doesn't untap during its controller's next untap step.…

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Flash
Enchant creature
Enchanted creature gets -2/-0. It gets -6/-0 instead as long as its controller has seven or more cards in their graveyard.

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Flying
When Tome Raider enters the battlefield, draw a card.

RULES TEXTWhen Corridor Monitor enters the battlefield, untap target artifact or creature you control.

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Scry 1. (Look at the top card of your library. You may put that card on the bottom of your library.)
Draw a card.

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Flying
Whenever you draw your second card each turn, Steelgaze Griffin gets +2/+0 until end of turn.

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Choose two target creatures controlled by different players. Return those creatures to their owners' hands.

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Flying
Adamant — If at least three blue mana was spent to cast this spell, Vantress Paladin enters the battlefield with an additional +1/+1 counter on it.

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Whenever Mistford River Turtle attacks, another target attacking non-Human creature can't be blocked this turn.

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Enchant creature
When Charmed Sleep enters the battlefield, tap enchanted creature.
Enchanted creature doesn't untap during its controller's untap step.