Had another idea.
Glacial Horror / Glacial Terror
6
/ 5
(price is probably too low, but hey, this is pre-Smithy)
2/5 / 2/5
Freeze: Upon attack, turn a random enemy permanent into a Frost Pillar.
Frost Pillar
0
Permanent
Generate 1 random quantum per turn. Defrosts in 3 turns.
A FEW NOTES:
Frost Pillar is not available in the bazaar. By "defrost," I mean it goes back to whatever it was. Freezing only works on one pillar at a time, not the whole stack. Normal Frost Pillars stack, but those in the weapon or shield slot stay there.