Brendar, Collector of Fables

Whenever you cast an adventure spell, put a
tale counter on Brendar, Collector of Fables.
At the beginning of your upkeep, create {x}
treasure tokens, where {x} is the number
of tale counters on Brendar, Collector of Fables.
{t}, Sacrifice two treasures: Return up to two
creatures you control or that are on an adventure
to their owner's hand.