mtg commander legal cards in commander, Rules Text: search your library, land, into your hand, onto the battle..., 13 Relatively New Player] Question: Why

If the copied creature is copying something else, then Deceptive Frostkite enters as whatever that creature copied, with the listed exceptions

Hapatra, Vizier of Poisons Hapatra, Vizier of Poisons is all about those -1/-1 counters, and its ability to create tokens and other synergies with them lands it pretty high

As a great final touch, these croak counters remain on exiled cards even if an opponent removes Grolnok, meaning they can still be cast once Grolnok is replayed from the command zone later

You cant sell your old Arena cards and the only way to get specific cards is by crafting them with wildcards , which you can outright buy, similar to buying singles like you can in paper Magic