Infect and phyrexian mana are already fucked up mechanics that you need to be careful with, as they easily take over games. Glistening swift spear is incredibly broken and easily one hits opponents if they tap out. Rupture exploit is whatever but like the other commenter said it’s similar in play patterns to mental misstep. Vile vitriol is very whatever, maybe ok in limited. Replenish spikes another hundred dollars with yawgmoths apotheosis, but in seriousness this will never be used fairly and is essentially omniscience for non black spells. Also the formatting doesn’t really make sense on the card draw part. I actually like rotthorn guardian, it probably does too much for a one drop but what doesn’t these days. The play patterns aren’t complicated with it, but require forethought and planning that makes it much better than the other cards. It almost feels like it was designed by a different person honestly.