Whenever you attack, up to one target attacking creature can't be blocked this turn. Return that creature to its owner's hand at the beginning of the next end step. Choose a Background (You can have a Background as a second commander.)

When Barrin enters, return up to one other target creature or planeswalker to its owner's hand. At the beginning of your end step, if a permanent was put into your hand from the battlefield this turn, draw a card.

Whenever one or more other creatures you control leave the battlefield without dying, draw a card. {1}{U}, {T}: Return another target creature you control to its owner's hand.

Flash Whenever a creature you control deals combat damage to a player, draw a card. When Enduring Curiosity dies, if it was a creature, return it to the battlefield under its owner's control. It's an enchantment. (It's not a creature.)

Flash Flying During each opponent's end step, you may cast spells as though they had flash.

Flash (You may cast this spell any time you could cast an instant.) Flying You may cast spells as though they had flash.

Ward {1} Other Frogs you control have ward {1}. When this creature enters, target creature you control can't be blocked this turn. Whenever that creature deals combat damage this turn, you may exile it. If you do, return it to the battlefield under its owner's control.

Ninjutsu {U} ({U}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.) Whenever this creature deals combat damage to a player, you may draw a card. If you do, discard a card unless this creature entered this turn.

Flash (You may cast this spell any time you could cast an instant.) Flying When this creature enters, sacrifice it unless you return another creature you control to its owner's hand.

Indestructible As long as your devotion to blue is less than five, Thassa isn't a creature. At the beginning of your end step, exile up to one other target creature you control, then return that card to the battlefield under your control. {3}{U}: Tap another target creature.

Whenever a permanent deals damage to you, return it to its owner's hand.

Whenever you cycle a card, you may pay {1}. When you do, exile target artifact or creature you control, then return it to the battlefield under its owner's control.

Enchant Island {2}: Enchanted Island becomes a 3/2 blue Spirit creature with flying until end of turn. It's still a land. When enchanted Island is put into a graveyard, you may return this card from your graveyard to your hand.

Creatures with flying get +2/+0. Creatures without flying get -2/-0.

Cleave {1}{U} (You may cast this spell for its cleave cost. If you do, remove the words in square brackets.) Return target nonland permanent [you control] to its owner's hand.

Kicker {1}{U} (You may pay an additional {1}{U} as you cast this spell.) Return target nonland permanent to its owner's hand. If this spell was kicked, draw a card.

Exile target creature you control, then return that card to the battlefield under its owner's control. Draw a card.

Return target creature to its owner's hand. Its controller draws a card.

Return target nonland permanent to its owner's hand. Foretell {U} (During your turn, you may pay {2} and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)

Exile up to two target creatures you control, then return those cards to the battlefield under their owner's control.

Return target nonland permanent and all other permanents with the same name as that permanent to their owners' hands.

Exile target creature you control, then return that card to the battlefield under its owner's control. If it's a Spirit, put a +1/+1 counter on it.

Return target creature to its owner's hand. If its mana value was 3 or less, scry 1. (Look at the top card of your library. You may put that card on the bottom.)

As an additional cost to cast this spell, return a creature you control to its owner's hand. Counter target spell.

Choose one — • Counter target creature or enchantment spell. • Return one or two target creatures and/or enchantments you own to your hand.

Exile two target artifacts, creatures, and/or lands you control, then return those cards to the battlefield under your control.

Choose one — • Target creature gains islandwalk until end of turn. (It can't be blocked as long as defending player controls an Island.) • Target creature gets +2/-1 until end of turn. • Target player discards a card.

Exile target artifact or creature, then return it to the battlefield under its owner's control with a +1/+1 counter on it.

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

Return target creature to its owner's hand. Untap up to two lands.

Return target spell or creature to its owner's hand.

Return target creature to its owner's hand.

Exile target creature you control, then return it to the battlefield under its owner's control. If that creature is a Bird, Frog, Otter, or Rat, draw a card.