Bonus action blindness/deafness + mind whip? Web + binding ice? Blur + mirror image? Enlarge + see invisibility?
Its still two 2nds and a 4th to pull off and doesnt skirt concentration so i guess its alright.
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Look up Beltyn's Burning Blood, is it good, doesn’t matter.
Is it fun and awesome, yes.
It kind of got ported to 5e, but what about the humble "explosive runes"?
For something less cheesy, how about Sakkaratar's Tripple Strike, which is basically haste but multi-target and attack-only. But it's +2 attacks explicitly rather than just "an extra". Only lasts 1 round too, but if you have an attack-heavy party this could be good burst.