Decade, Hero of Generations

Haste

When Decade, Hero of Generations enters the battlefield, you may reveal a creature card from your hand. If you do Decade, Hero of Generations becomes a copy of that creature until end of turn

Whenever another creature enters under your control Decade, Hero of Generations may become a copy of that creature until end of turn, you may choose to keep this creature's power and toughness or change it to that of the other creature.