Falco Spara, Pactweaver + Sensei's Divining Top + Phyrexian Altar

Falco Spara, Pactweaver

Sensei's Divining Top

Phyrexian Altar

How it works

1. Activate Sensei's Divining Top's second ability by tapping it, causing you to draw a card and put Sensei's Divining Top on top of your library from the battlefield.
2. If the persist or undying creature does not have a -1/-1 or +1/+1 counter on it, activate Phyrexian Altar by sacrificing the creature, adding 1
3. When the creature dies, its persist or undying ability triggers, returning it from your graveyard to the battlefield with either a -1/-1 or +1/+1 counter on it.
4. Cast Sensei's Divining Top from the top of your library by paying 1 and removing the +1/+1 or -1/-1 counter from the persist or undying creature.
5. Repeat.