mtg online only cards arena digital MTG Arena Alchemy digital card review Digital Only New Commander :

If you just want a clean, straightforward one-turn kill, Chandra's Ignition is a pretty good option, able to smite every creature and player in such dramatic fashion that they probably won't really mind

This can lead to infinite combos with Hellkite Charger and Aggravated Assault, or allow commanders like Flamewar or Amber Gristle OMaul to storm off with repeated extra combat spells

Ruthless and efficient, he is a master ninja covered in magical tattoos that he can freely manipulate

That should bring the price back down to $1 or so

However, if you want to be really oppressive, combine him with quick token generation cards like Smothering Tithe