Flamekin Harbinger [Secret Lair Drop Series] XY208 what would it be

what would it be

Set: Double Masters 2022 Type: Enchantment Rarity: Mythic Cost: {2}{G} Exile a creature you control: Add X mana of any one color

Set: XY: Ancient Origins Type: Lightning Rarity: Ultra Rare Retreat cost: Colorless

the idea must exist

and it has "{2}{U}{U}: Return this creature to its owner's hand at the beginning of the next end step

Flamekin Harbinger [Secret Lair Drop Series] XY208 what would it beSet: Secret Lair Drop Series Type: Creature Elemental Shaman Rarity: Rare Cost: {R} When Flamekin Harbinger enters the battlefield, you may search your library for an Elemental card, reveal it, then shuffle and put that card on top.