Arcane Signet - [Foil, Borderless] Commander Masters (CMM){T}: Add one mana of any color in your commander's color identity. Matic had only taken the ring to appease his grandmother when she'd pressed it insistently into his palm. As the rats scurried away from its light, he understood her urgency.

discard it into exile

Other black creatures you control get +1/+1

each creature gets -X/-X until end of turn

"My home is Kamigawa

Exile two cards from your graveyard: Psychatog gets +1/+1 until end of turn

I'll stab them in the back while they sleep if I have to

unlike theirs

When Mitotic Slime dies

Each creature you control gets +1/+0 for each time it has attacked this turn

Grey ruins falling into darkness

{W}{W}{U}{U}{B}{B}{R}{R}{G}{G}

{2}{G}: Regenerate Rhox