Hi, I'm main sup currently platinum 4 and if you check my Zyra KDA you will see that it...sucks. It depends on the team, if the team is good you will carry, if not you will feed because you have no escape. I didn't list any good or bad matchups because I don't think there are any bad matchups, Zyra is a poke champ and if Blitzcrank gets you before you poke the hell out of him, then you are playing it wrong. Try to save your ulti when there are a lot of enemies who can't escape and plants alive in there, if there aren't any plants ult dmg is negligible unless you aim for knock up/stall or kills of low hp champs. Also try not to pick Zyra if the team doesn't have any tanks. Before level 3 only hit plants generated by your passive as just hitting enemies with your q,e deals too weak dmg. Combo : pretty obvious, first make sure you hit your e, then use w and q otherwise don't waste mana. Another thing, if the jungler is with top, don't do gromp/golems as in patch 6.13 Zyra's passive is nerfed and there won't be enough plants generated.