Not only does it buff your creature, but it also turns into a tutor for instants
This giant axolotl is straight cheesing and clearly wants a handshake with its tiny little T-rex hands
Additionally, if your deck has a high density of spells, utility rocks like Mind Stone provide a fail-safe by allowing you to sacrifice them for a card in the late game when your mana is already settled
They work OK within the framework of Commander, so we arent going to ban them, but are likely to give your playgroup a headache or lead to problematic games if youre not careful
Unfortunately, its a nombo with a lot of cube-worthy equipment like all of the Mirrodin / Scars Swords, Grafted Wargear, and Umezawas Jitte, but thems the breaks
Valki, God of Lies // Tibalt, Cosmic Imposter Modal Double-Faced Cards have been one of my favorite design additions to Magic in a long time