Vigean Hydropon

Graft on a body that can't enter combat strips the mechanic down to a pure counter battery, and that's the design conceit: a 0/0 arriving loaded with five +1/+1 counters whose only purpose is to migrate onto creatures you play afterward. Most graft creatures hedge, holding a usable body so the counters they never give away still amount to something. This one refuses the hedge. The five counters are stranded the instant it enters, valuable only as later creatures pull them off, which turns every subsequent creature drop into a free stat distribution. The friction is timing: a graft trigger fires only when a creature enters after this one, so anything you've already committed gets nothing, and the counters reward sequencing your creatures around the battery rather than dumping them first. Five is also a large single graft payload, making this an efficient counter-per-mana source in the keyword, paid for entirely by the inability to swing or chump. It's a battery you discharge slowly, one entering creature at a time, and it only does work in a deck building toward a wide, counter-hungry board rather than funneling everything into a single threat.