You may choose not to untap Callous Oppressor during your untap step. As Callous Oppressor comes into play, an opponent chooses a creature type. T: Gain control of target creature that isn't of the chosen type as long as Callous Oppressor remains tapped.
If Clambassadors damages any player, choose an artifact, creature, or land you control. That player gains control of that artifact, creature, or land.
Whenever you cast a blue spell, target player puts the top two cards of their library into their graveyard.
Choose a creature type other than Legend or Wall. Each creature's type becomes that type until end of turn.
Counter target noncreature spell. Its controller creates two Treasure tokens. (They're artifacts with "T, Sacrifice this token: Add one mana of any color.")
Hexproof (This creature can't be the target of spells or abilities your opponents control.) Invisible Stalker is unblockable.
If a creature would come into play under an opponent's control this turn, it comes into play under your control instead.
Whenever Elvish Mariner attacks, scry 1. Whenever you scry, tap up to X target nonland permanents, where X is the number of cards looked at while scrying this way.
Look at the top three cards of your library. Put one of them into your hand and the rest on the bottom of your library in any order. Proliferate.
Enchant land When Spreading Seas enters the battlefield, draw a card. Enchanted land is an Island.
Flying Haughty Djinn's power is equal to the number of instant and sorcery cards in your graveyard. Instant and sorcery spells you cast cost 1 less to cast.
Flash When Venser, Shaper Savant enters the battlefield, return target spell or permanent to its owner's hand.
Flying Whenever you cast a noncreature spell, incubate X, where X is that spell's mana value. (Create an Incubator token with X +1/+1 counters on it and "2: Transform this artifact." It transforms into a 0/0 Phyrexian artifact creature.)
Each opponent mills fourteen cards. Cycling 1U (1U, Discard this card: Draw a card.) When you cycle Fractured Sanity, each opponent mills four cards.