Activate Francisco using Walking Ballista's  second ability by removing a +1/+1 counter on it, dealing 1 damage to an opponent.
Francisco triggers, causing you to reveal the top card of your library, put a +1/+1 counter on Francisco and put the card back on top of your library.
Repeat.

Infinite damage

Francisco, Fowl Marauder

Walking Ballista

Agatha's Soul Cauldron

Activate Francisco using Triskelion's ability by removing a +1/+1 counter on it, dealing 1 damage to an opponent.
Francisco triggers, causing you to reveal the top card of your library, put a +1/+1 counter on Francisco and put the card back on top of your library.
Repeat.

Combos with "Francisco, Fowl Marauder"