Gravitic Punch, Kalamax, the Stormsire, and Refuse // Cooperate

Prerequisites

• Gravitic Punch in hand
• Kalamax, the Stormsire on the battlefield
• Refuse // Cooperate in the graveyard
• available

Steps

1. Cast Gravitic Punch by paying its mana cost, targeting Kalamax
2. Holding priority, cast Cooperate by paying its aftermath cost, targeting Gravitic Punch
3. Kalamax's first and second abilities trigger
4. Resolve the first ability, creating a copy of Cooperate targeting the original Cooperate
5. Resolve the second ability, putting a +1/+1 counter on Kalamax
6. Resolve the Cooperate copy, creating a copy of Cooperate, targeting the original Cooperate
7. Kalamax's second ability triggers, putting a +1/+1 counter on itself
8. Repeat from step 6 any number of times
9. Once you have an arbitrarily large Kalamax, have the final Cooperate copy target Gravitic Punch
10. This'll create two copies of Gravitic Punch in addition to the original Gravitic Punch
11. Resolve all Gravitic Punches, dealing infinite damage to each of up to three opponents

Results

• Infinite magecraft triggers
• Infinite +1/+1 counters on a creature
• Infinite damage