Sneak Attack [The List] Archon and you may spend mana

and you may spend mana as though it were mana of any color to cast spells this way

Set: Friday Night Magic 2000 Type: Sorcery Rare Cost: {2}{R} Destroy target land

Set: Love Your LGS 2020 Type: Artifact Creature — Construct Rarity: Rare Cost: {X}{X} Hangarback Walker enters the battlefield with X +1/+1 counters on it

Sacrifice Sword of the Ages and any number of creatures you control: Sword of the Ages deals X damage to any target

Sneak Attack [The List] Archon and you may spend manaSet: The List Type: Enchantment Rarity: Rare Cost: {3}{R} {R}: You may put a creature card from your hand onto the battlefield. That creature gains haste. Sacrifice the creature at the beginning of the next end step. "Nothin' beat surprise'cept rock."