"Kensuke Okabayashi" (7)
: Look at the top card of your library.
: Reveal the top card of your library. If it's a land card, Callous Deceiver gets +1/+0 and gains flying until end of turn. Activate only once each turn.
, : Counter target spell unless its controller pays .
Channel — , Discard Ghost-Lit Warder: Counter target spell unless its controller pays .
, Sacrifice a creature: You gain 2 life.
: Search your library for a card, put that card into your hand, then shuffle.
At the beginning of your upkeep, you may have target creature you control get +X/+X until end of turn, where X is the number of creatures you control. If you do, sacrifice that creature at the beginning of the next end step.
When Kiri-Onna enters the battlefield, return target creature to its owner's hand.
Whenever you cast a Spirit or Arcane spell, you may return Kiri-Onna to its owner's hand.
Flying
Rimefeather Owl's power and toughness are each equal to the number of snow permanents on the battlefield.
: Put an ice counter on target permanent.
Permanents with ice counters on them are snow.
Gatherer works better in the Companion app!
: Put an ice counter on target permanent.