Ichorid [Eternal Masters] Human Archer it produces mana of a

it produces mana of a color of your choice instead of any other type

Set: Mirage Type: Artifact Rarity: Rare Cost: {4} At the beginning of each player's end step

Set: From the Vault: Annihilation Type: Sorcery Rarity: Mythic Cost: {3}{B}{B} Each player exiles all creature cards from their graveyard

If Ugin's Nexus would be put into a graveyard from the battlefield

Ichorid [Eternal Masters] Human Archer it produces mana of aSet: Eternal Masters Type: Creature Horror Rarity: Rare Cost: {3}{B} Haste At the beginning of the end step, sacrifice Ichorid. At the beginning of your upkeep, if Ichorid is in your graveyard, you may exile a black creature card other than Ichorid from your graveyard. If you do, return Ichorid to the battlefield.