pokemon card dialga ex full art - 122/119 - Secret Rare Placeholder Image Provided Dialga (Full Art Promo) XY77/108

The Commander Rules Committee has clarified that [c]ompanion will operate in Commander similarly to other formats (meaning youll have to pay the 3, etc.), save that it will not come from your sideboard. One of the exciting new mechanics in Ikoria: Lair of Behemoths is companion, which places constraints on your deck-building in return for letting you cast some amazing rewards from your sideboard

It also wasn't because of whether you decided to use it on any given turn, or whether to cast it

Nevertheless, they are absurdly powerful theft commanders, just make sure you're talking to the table before you start playing to make sure everyone knows what they're in for.

It's not the worst plan, to be honest, but I'm still not bullish on either of these creatures