Flourishing Ballista ScalesWalking Ballista Buy + Rite of Passage Buy + Hardened Scales Buy
I realized a way to do it cheaper immediately following my last post with ballista.
Start with 3 counters on Ballista. Pull one counter off, target itself, it gets two counters back on it. As long as you resolve them in this manner (one at a time) it builds up to a creature with an arbitrary number of counters on it.
Nobody has posted any comments about this Combo, but you can be the first!