Temporal Aperture [Urza's Saga] Elemental Avatar Whenever Blizzard Specter deals combat

Whenever Blizzard Specter deals combat damage to a player

each player chooses artifact

But it is easy

You may cast artifact spells as though they had flash

Flashback {5}{B}{B} (You may cast this card from your graveyard for its flashback cost

Temporal Aperture [Urza's Saga] Elemental Avatar Whenever Blizzard Specter deals combatSet: Urza's Saga Type: Artifact Rarity: Rare Cost: {2} {5}, {T}: Shuffle your library, then reveal the top card. Until end of turn, for as long as that card remains on top of your library, play with the top card of your library revealed and you may play that card without paying its mana cost. (If it has X in its mana cost, X is 0.)