First strike (This creature deals combat damage before creatures without first strike.),
trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.),
haste (This creature can attack, and as soon as it comes under your control.)
Whenever Life of the Party attacks, it gets +X/+0 until end of turn, where X is the number of creatures you control.
When Life of the Party enters the battlefield, if it's not a token, each opponent creates a token that's a copy of it. The tokens are
goaded (It attacks each combat if able and attacks a player other than you if able.) for the rest of the game.