Flying, vigilance
Snow lands your opponents control enter the battlefield tapped.
Noncreature spells your opponents cast with converted mana cost 4 or more cost 2 more to cast.
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Valkmira, Protector's Shield
If a source an opponent controls would deal damage to you or a permanent you control, prevent 1 of that damage.
Whenever you or a permanent you control becomes the target of a spell or ability an opponent controls, counter that spell or ability unless its controller pays 1.