Altair, Brotherhood Mentor - Kelsien, the Plague (Rainbow Foil) [Secret Lair Drop Series] Planeshift and they may spend mana

and they may spend mana as though it were mana of any color to cast that spell

but I can think of a better use for that

Source 2: Scourge booster pack purchase bonus (2003)

There's very little that merchants won't buy— and even less that wastelanders won't sell

"The gods here may walk among the people

Altair, Brotherhood Mentor - Kelsien, the Plague (Rainbow Foil) [Secret Lair Drop Series] Planeshift and they may spend manaSet: Secret Lair Drop Series Type: Legendary Creature Human Assassin Rarity: Mythic Cost: {R}{W}{B} Vigilance, haste Altar, Brotherhood Mentor gets +1 +1 for each experience counter you have. T: Altar deals 1 damage to target creature you don't control. When that creature dies this turn, you get an experience counter. When purchasing this unique product, please keep in mind that this card only appears in the Secret Lair Summer Superdrop 2024 and will