Gravitic Punch + Kalamax, the Stormsire + Twincast

Prerequisites

• You have not cast an instant spell this turn.

Steps

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

Effects

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