Kalamax, the Stormsire | Refuse // Cooperate

Cards

({2} magic symbol) ({U} magic symbol) plus the cost of the additional sorcery available.

Cast any sorcery by paying its mana cost.
Holding priority, cast
Cooperate by paying its mana cost.
Kalamax's first and second abilities trigger.
Resolve the first ability, creating a copy of
Cooperate and choosing to copy the original
Cooperate.
Resolve the second ability, putting a +1/+1 counter on
Kalamax.
Resolve the
Cooperate copy, creating a copy of
Cooperate.
Kalamax's second ability triggers, putting a +1/+1 counter on itself.
Repeat from step 6 any number of times.

This combo has been estimated to be Oddball (Bracket 2-3+).