This card (The Ozolith) seems bonkers. I can't put my finger on what I want to do with it though. The best I could think of besides the usual (clockwork creatures, arcbound ravager, etc) was Dusk Urchins. Kathril, Aspect Warper seems nuts with it too but I'm not a fan of the menagerie-type keyword-soup decks that some cards trap you into playing. It becomes a 1-mana Akroma's Memorial with it at full speed though. You can slot them into Managorger Hydra decks to keep the momentum rolling and it's a fine card but not insanely broken.
Coretapper can tap itself to put a ton of counters on itself AND sacrifice itself, AND the self-sacrifice puts the counters directly on the Ozolith. The issue is, charge counters mostly deal with noncreature artifacts. You could use Chimeric Mass if you time it right. The only other creature I found was Surrakar Spellblade.