Thopter Squadron + Dross Scorpion + Gilded Lotus

Thopter Squadron

Dross Scorpion

Gilded Lotus

How it works

1. Activate Gilded Lotus by tapping it, adding three mana of any one color.
2. Activate Thopter Squadron first ability by paying 1 and removing +1/+1 counter, creating a 1/1 Thopter token.
3. Activate Thopter Squadron second ability by paying 1 and sacrificing a Thopter, putting a +1/+1 counter on itself.
4. Dross Scorpion triggers, untapping Gilded Lotus.
5. Repeat.