There are so many options, its tough to figure out where to go
BPhillipYork: This can be broken, there's way to create mana enough to blink this, Dockside Extortionist is an obvious huge mana generator here, but there's also Su-Chi and other sources, you could also do something like sacrificing Gnawing Vermin or Stitchers Supplier and generate a lot of mill, if you were into that sort of thing
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SHRIEKMAW Shriekmaw is probably the elemental I encountered the most of when I first started playing Commander, and for many years basically until Ravenous Chupacabra hit the scene it reigned as one of the better options for an EtB removal spell low on the curve, that could be reanimated when needed
Therefore, we state that you are an Officially Authorized Pokmon Card Illustrator and admire your skill. Ah, there we are