Entei (HGSS20) [HeartGold & SoulSilver: Black Star Promos] Astral Pack 5 or the effect of an

or the effect of an Effect Monster is activated

when exactly 1 Synchro Monster is Special Summoned to your opponent's side of the field: You can banish this card from your Graveyard to target that face-up Synchro Monster

Set: Battle for Zendikar Prerelease Promos Type: Creature — Eldrazi Rarity: Rare Cost: {6} When you cast this spell

if a "Sinister Serpent" exist in your Graveyard

" This deck wins by using Opposition and Static Orb to establish a lock down while legions of Merfolk overrun opponents' immobilized defenses

Entei (HGSS20) [HeartGold & SoulSilver: Black Star Promos] Astral Pack 5 or the effect of anSet: HeartGold & SoulSilver: Black Star Promos Type: Fire Rarity: Black Star Promo Retreat cost: Colorless