That, to me, is the hallmark of an excellent Cube card
New-to- Arena Reprints For the new-to- Arena reprints, we're going to be using the same criteria, although here we'll be focusing exclusively on rares and mythics, partly because there are simply too many commons and uncommons to rank them all and partly because commons and uncommons are the easiest cards to access on Arena
Kroxa is happy to be used in either scenarios
Its effect to pay the top card of your library is easy to accomplish and can be done at instant speed, so even if you have removal for Urza, the effect can be used multiple times before it ever resolves
They can also view common cards in the archetype and make substitutions based on their collection
This is the single best way to find out out what works, what doesnt, and most importantly, why