Aetherflux Conduit [Aetherdrift Commander]

Description:

Whenever you cast a spell, you get an amount of {E} (energy counters) equal to the amount of mana spent to cast that spell.
{T}, Pay fifty {E}: Draw seven cards. You may cast any number of spells from your hand without paying their mana costs. As Kaladesh became Avishkar, aether finally started flowing freely to all.