Isochron Scepter + Roar of the Kha + Skilled Animator

Isochron Scepter

Roar of the Kha

Skilled Animator

How it works

1. Cast Skilled Animator by paying 2.
2. Skilled Animator enters the battlefield, targeting Isochron Scepter, causing it to become an artifact creature until end of turn.
3. Activate creatures you control by tapping those, adding 3.
4. Activate Isochron Scepter by paying 2 and tapping it, casting a copy of Roar of the Kha without paying its mana cost, untapping all creatures.
5. Repeat from step 3.