0: Until end of turn, Arlinn becomes a 5/5 Werewolf creature with trample, indestructible, and haste
The extreme scarcity of this card has turned it into a chase within the collecting community, as pull rates are notoriously brutal and require opening multiple cases of booster boxes to find a single copy
Hive Mind takes every instant or sorcery cast by any player and forces each other player to cast a free copy
While this is a fine card, Im not sure Id keep it in the deck
Youll also want to shuffle your deck with an effect if you mulliganed away some copy effects to the bottom of your deck
Red has access to plenty of mass artifact destruction spells, like Shatterstorm or Brotherhood's End, but being able to break symmetry on an effect like this is a huge boon in Commander games, since it doesn't punish you for running out your own artifacts early and often.