Ornery Tumblewagg | Crystalline Crawler | Hellkite Charger

Cards

Crystalline Crawler has at least five +1/+1 counters on it.
Ornery Tumblewagg does not have summoning sickness.
Hellkite Charger and
Ornery Tumblewagg cannot be blocked and killed by an opponent.

Activate
Ornery Tumblewagg's saddle ability by tapping
Crystalline Crawler, causing
Ornery Tumblewagg to become saddled until end of turn.
At the beginning of your combat phase,
Ornery Tumblewagg's first ability triggers, putting a +1/+1 counter on
Crystalline Crawler.
Declare
Ornery Tumblewagg and
Hellkite Charger as attackers.
Ornery Tumblewagg's second ability and
Hellkite Charger trigger.
Resolve the
Ornery Tumblewagg trigger, doubling the number of +1/+1 counters on
Crystalline Crawler.
Activate
Crystalline Crawler's first ability seven times by removing seven +1/+1 counters from it, adding ({5} magic symbol) ({R} magic symbol) ({R} magic symbol) .
Resolve the
Hellkite Charger trigger, causing you to pay ({5} magic symbol) ({R} magic symbol) ({R} magic symbol) to untap all attacking creatures you control and to get an additional combat phase after this one.
Repeat from step 2.
If
Crystalline Crawler begins the combo with six or more +1/+1 counters, this combo will net infinite +1/+1 counters on it and colored mana, which will allow you to target any other creature(s) using
Ornery Tumblewagg's triggers.