Leif, Gloaming Warlock

Leif, Gloaming Warlock enters the battlefield with a number of counters equal to the amount of mana used to cast it
{2}{t}: Add X colorless mana to your mana pool, where X is the number of charge counters of Leif, Gloaming warlock
{1}{t}: Add a charge counter to Leif, Gloaming Warlock