Daring Mechanist

{3}, {t}: Regenerate target artifact creature. If it's a Vehicle, put a +1/+1 counter on it.
Titanfall — Whenever a creature or Vehicle with base power 5 or greater enters the battlefield under your control, put a +1/+1 counter on it.
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A flea on a dog's back, she climbs unseen over incomprehensible masses of metal to turn the tides of battle.