Poppy is nasty, but wins depends on team play and hopefully you don't get any d/cers or afkers

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There is no "best" at Dominion. I've beaten more Poppy's than I've lost to and the same goes for Jax. I'm probably a 90% win rate against Akali players as well.

Team comp is what matters, not who has the "op team". I would say Kassadin/Karthus tie for best AP caster in Dominion, but that is just AP. There is no "one best at Dominion".

imma be boring and say rammus. it obvious he can reach the highest mvt spd in the game making his capping ability amazing. then there is the fact that he is a tank. so defending can def be considered one of his fortes. there is also the rest of his skill kit. taunt helps more with the defending aspect. his w works stupidly well against auto attack champs being that is the meta for dominion right now. then there is his passive. again because ad champs are the meta right now, just stacking armor and getting thornmail will pwn most of the games you play with rammus.

singed

Teemo. Won 7 games in a row with him. (see my match history right now)

Probably tryndamere. If the game goes late you just automatically lose. Because unlike in SR your whole team won't be around to CC him to death and he'll just roll over anyone once fully built.

rammus because he has a global ultimate with a 6 second cooldown?

A fully farmed AP poppy makes me want to smash my computer. That ult is absurd in this mode.