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'Whenever you cast an instant or sorcery spell, create a 1/1 blue Bird Illusion creature token with flying.
'{X}{B}, {T}, Discard a card: Target creature gets +X/+0 until end of turn.
'Whenever another creature you control enters, put a +1/+1 counter on this creature. As long as this creature has three or more +1/+1 counters on it, it has flying and...
'Flash When this creature enters, prevent all damage that would be dealt to you this turn. Whenever damage that would be dealt to you is prevented, put that many +1/+1...
'This creature can't be blocked. Whenever you cast a noncreature spell, put an oil counter on this creature. Whenever this creature deals combat damage to a player, you may remove...
'All Slivers have "{T}: Target player mills a card."
'Flying
Pay 1 life: Regenerate this creature.
'Myriad, myriad (Whenever this creature attacks, for each opponent other than defending player, you may create a token that's a copy of this creature that's tapped and attacking that player...
Changeling (This card is every creature type.)
Flash
'Ward {2} (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {2}.) Morbid — At the beginning of your...
'When this creature enters, create a number of 1/1 black Rat creature tokens equal to the number of opponents you have. {1}{B}, Sacrifice a creature: Target creature gets -2/-2 until...
'Whenever you surveil for the first time each turn, this creature deals 1 damage to each opponent and you gain 1 life.