Fibearnacci Sequence

At the beginning of your end step, put X sum counters on Fibearnacci Sequence, where X
is the number of sum counters put onto it last
turn plus the number of sum counters put onto
it the turn before. If Fibearnacci Sequence has
no sum counters on it, put a sum counter onto it instead.
At the beginning of your upkeep, create a 2/2
green Bear token for each sum counter on Fibearnacci Sequence.