Velkhana, Iceborne Wyvern

Double Strike, Flying
When Velkhana, Iceborne Wyvern enters the
battlefield, you may summon a 0/2 blue-white
ice wall tokens with defender. While you control
an ice wall token, Velkhana, Iceborne Wyvern
has Hexproof.
{x}{7}: Summon {x} 0/2 blue-white ice
wall tokens with defender.