Mobilize could still see play in specific decks that prioritize untapping creatures for combat or combo purposes
#08 Aminatou, Veil Piercer I was hooked the second I saw the preview for this commander
10 Terastodon A classic reanimation target for years, Terastodon can absolutely devastate an opponent if cast early enough or efficiently remove problematic cards on the board
When you have access to the best mana ramp, tutors, and card draw effects in the game, it wont take long to build huge hydras like Hydroid Krasis, token generators like Empty the Pits, or powerful payoffs like Villainous Wealth, all of which can be doubled on the cheap via Unbound Flourishing and will be making huge attackers simply for casting these spells
Blue Ice Magic (decent) Ice Magic is basically Unsummon, Griptide, and a weird 8-mana removal spell all at once
But instead of going Grixis Superfriends, why not just go 5C Superfriends instead