Aetherflux Reservoir [Kaladesh Prerelease Promos]

Aetherflux Reservoir [Kaladesh Prerelease Promos]Set: Kaladesh Prerelease Promos Type: Artifact Rarity: Rare 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. While most power is used for ordinary, everyday tasks, one shouldn't underestimate its potential for the extraordinary.

The Sunken Ruin houses all the learning of a long-forgotten age

and that player can't activate abilities that aren't mana abilities

{T}: Add {G}{G}

Set: Shadows over Innistrad Prerelease Promos Type: Creature — Spirit Knight Rarity: Rare Cost: {5}{W}{W} Flying

If that mana is spent on an instant or sorcery spell

Skybridges from across Kylem converge at the grand stadium of Valor's Reach

Set: Antiquities Type: Artifact Creature — Golem Rarity: Rare Cost: {9} Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking

Set: Pro Tour Promos Type: Enchantment Rarity: Rare Cost: {3}{G}{W} Creatures you control get +1/+1

it creates twice that many of those tokens instead

if you control no creatures

Set: Alpha Edition Type: Instant Rarity: Uncommon Cost: {U}{U} Counter target spell

First strike (This creature deals combat damage before creatures without first strike