pokemon black and white boundaries crossed booster pack - & - seen powerful Ace Spec Trainer cards which are so devastating that you can only carry one into battle Pokemon Black & White Boundaries

Take a look and see

Angel of Despair Angel of Suffering Atraxa, Grand Unifier Atraxa, Grand Unifier Atraxa, Praetors' Voice Cleaving Reaper Crypt Angel Deathpact Angel Desolation Angel Drana and Linvala Eradicator Valkyrie Fallen Angel Firja, Judge of Valor Hailstorm Valkyrie Ixhel, Scion of Atraxa Liesa, Forgotten Archangel Liesa, Shroud of Dusk Maelstrom Archangel Magister of Worth Renegade Reaper Rodolf Duskbringer Selenia, Dark Angel Sephiroth, One-Winged Angel Seraph of New Phyrexia Seraph of the Scales Shattered Seraph Tariel, Reckoner of Souls Vengeful Reaper Weeping Angel

Will this Stifle put me in position to win the game, or is there a better situation for it to be played

If a card in your library has X in its mana cost, X is considered to be 0

Forget about Standard, I would be surprised if this wasn't playable in Modern - at least as a sideboard option for dealing with artifact/enchantment heavy decks

The mill deck in Modern wants this, but also a variety of Vengevine combo decks throughout the games history have come back to this as an exceptional 1-drop thats good at filling the graveyard quickly