Falco Spara, Pactweaver + Sensei's Divining Top + Temur Battlecrier + Lyla, Holographic Assistant

Falco Spara, Pactweaver

Sensei's Divining Top

Temur Battlecrier

Lyla, Holographic Assistant

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.
2. Lyla triggers, putting a +1/+1 counter on it.
3. Cast Sensei's Divining Top from the top of your library by paying 0 and removing a counter from a creature you control.
4. Repeat.

This clever loop turns the top of your library into an endless engine by using Falco Spara, Pactweaver to cast spells directly from it. Sensei's Divining Top fuels this by cycling itself back to the library whenever you tap it to draw, while Temur Battlecrier reduces its casting cost to zero so you never run out of mana. Finally, Lyla, Holographic Assistant steps in with her triggered ability, constantly replenishing the counters on your creatures so Falco Spara, Pactweaver always has a cost to pay to cast Sensei's Divining Top all over again.