All you need is to survive one more of your opponents attacks so that you can untap and cast your game-winning spell
P/T Number 11 Language English Legal Formats Commander, Legacy, Vintage Not Legal Formats Alchemy, Brawl, Competitive Brawl, Historic, Modern, Pauper, Pioneer, Standard, Timeless Rulings (10/4/2004) You may tap any untapped permanents you control with the appropriate creature type (including this creature) to pay the cost of the ability, including creatures that haven't been under your control continuously since the beginning of your most recent turn.

$24.99 Sol Ring (Deadpool - Pool Party Foil) Secret Lair $1.79 Songs of the Damned Ice Age $18.99 Deadpool, Trading Card (1753 - Foil) Secret Lair $0.79 Cursed Mirror Secrets of Strixhaven Commander Decks $1.29 Survivors' Encampment Hour of Devastation $4.99 Lightning Bolt (Deadpool - Pool Party Foil) Secret Lair $1.29 Thrill of Possibility (Deadpool - Pool Party Foil) Secret Lair $0.79 Twinflame Secrets of Strixhaven Commander Decks $0.99 Arcane Signet Secrets of Strixhaven Commander Decks $8.99 Sol Ring (Deadpool - Foil) Secret Lair $2.79 Deadly Dispute (Deadpool - Pool Party Foil) Secret Lair $3.49 Vandalblast (1757 - Foil) Secret Lair 0 results found
Its too slow for anything but Commander, but its excellent there as a source of many continuous effects: cast from exile, card draw, life loss, and so on