Infinite card drawNear-infinite creature ETBInfinite draw triggersNear-infinite colored manaNear-infinite creature tokensNear-infinite untap of creatures you controlNear-infinite mana creatures you control can produce
How it works
Activate Karn by paying 1, causing Halo Fountain to become a creature.
Activate Harabaz Druid by tapping it, adding at least .
Activate Halo Fountain's second ability by paying , tapping it, and then untapping it and Harabaz Druid, causing you to draw a card.