Lutri, the Spellchaser Poor Bloomburrow world, the companion restrictions mean that every deck with blue and red in its color identity could include a copy at no cost
That's good, even at such a high cost, yet Scour from Existence is strictly better at 7 mana and instant speed
Witherbloom, the Balancer Mana cost: Colors: Golgari Power/Toughness: 5/5 I did not expect to be writing about a spellslinger commander in Golgari, and yet here we are
Selch is also comparable to Kiora, the Rising Tide, a staple of Abhorrent Oculus lists in Standard, and given that Kiora has a hard time fitting into every Oculus list, it's hard to imagine a card that requires twice as many cards in the graveyard appearing in an archetype that sometimes needs to exile five to cast its main threat
For example, if you play a deck that includes black, white, and red spells, a land like Nomad Outpost is a good solution