Nova, Dominion Ghost

At the beginning of your upkeep, put a hexproof counter on Nova. If Nova deals or is dealt
damage, remove all hexproof counters on Nova.
3 XP: {1}{u}, {t}: Create a 1/2 blue Nova Clone creature token with haste and "This creature
must be blocked if able." Exile it at the beginning
of your next upkeep.
7 XP: {t}: Nova deals 3 damage to any target.
10 XP: At the beginning of each other players
upkeep, untap Nova and put a hexproof counter
on her.