Aetherflux Reservoir (Retro Schematic) [The Brothers' War Retro Artifacts] Bloomburrow return to your hand target

return to your hand target artifact card in your graveyard with lesser mana value

each noncreature

Detonate deals X damage to that artifact's controller

there is an additional combat phase

Then if it has exactly four +1/+1 counters on it

Aetherflux Reservoir (Retro Schematic) [The Brothers' War Retro Artifacts] Bloomburrow return to your hand targetSet: The Brothers' War Retro Artifacts Type: Artifact Rarity: Mythic Cost: {4} Whenever you cast a spell, you gain 1 life for each spell you've cast this turn. Pay 50 life: Aetherflux Reservoir deals 50 damage to any target. "These estimates are conservative. Its true capacity may be far, far greater." Research notes, signature illegible