Steel Dromedary

A camel that carries counters instead of cargo, and the whole design is built around the friction of moving them one at a time. It walks onto the battlefield tapped and stays tapped as long as it holds a +1/+1 counter, so the body is inert until you unload it: each combat you may hand a counter to another creature, and once the last one is gone it can finally untap on a later untap step into a plain 2/2. That trade turns it into a slow-drip counter battery, ferrying a growth spell across your board over two or three turns rather than dumping it all at once. Cast it in your pre-combat main phase and the trigger fires that same turn, so the ferrying starts immediately: summoning sickness never gates a triggered ability, only attacking and tapping for costs. The reward for the patience is any card that cares about counters entering or moving: proliferate, adapt payoffs, or a creature that triggers when it grows. What it cannot do is swing while loaded; the immobility is not a flaw to work around but the entire point, since the camel is transport, not a threat. It sits in the small tradition of artifact creatures that exist to relocate counters rather than fight with them, a niche that pays off in a deck already committed to the +1/+1 counter axis and does almost nothing in one that isn't.