Iraxxa, Empress of Mars | Squee, the Immortal | Phyrexian Altar

(and one other card)

Squee in exile or in your graveyard.
All other permanents on the battlefield.
({R} magic symbol) ({R} magic symbol) , plus an additional ({3} magic symbol) minus ({1} magic symbol) for each +1/+1 counter on
Runaway Steam-Kin available.

If
Runaway Steam-Kin has three or more +1/+1 counters on it, activate it by removing three +1/+1 counters from it, adding ({R} magic symbol) ({R} magic symbol) ({R} magic symbol) .
Cast
Squee from your graveyard or from exile by paying ({1} magic symbol) ({R} magic symbol) ({R} magic symbol) .
Iraxxa and
Runaway Steam-Kin trigger.
Resolve the
Iraxxa trigger, creating a 2/2 Alien Warrior creature token.
Resolve the
Runaway Steam-Kin trigger, putting a +1/+1 counter on it.
Activate
Phyrexian Altar twice by sacrificing
Squee and the Alien Warrior, adding ({R} magic symbol) ({R} magic symbol) .
Repeat.