Revel in Riches [Mystery Booster] Wrenn you may return Nether Spirit

you may return Nether Spirit to the battlefield

"'Tis a shame

change Halfdane's base power and toughness to the power and toughness of target creature other than Halfdane until the end of your next upkeep

Set: Mirage Type: Instant Rarity: Uncommon Cost: {U} Search your library for an instant or sorcery card

Femeref tutor

Revel in Riches [Mystery Booster] Wrenn you may return Nether SpiritSet: Mystery Booster Type: Enchantment Rarity: Rare Cost: {4}{B} Whenever a creature an opponent controls dies, create a Treasure token. (It's an artifact with "{T}, Sacrifice this artifact: Add one mana of any color.") At the beginning of your upkeep, if you control ten or more Treasures, you win the game.