Averon, The Wanderer

Vigilance, Trample

When Averon, The Wanderer enters the battlefield, the season become spring (When the season is spring, at the beginning of every players upkeep, all players at the table draw a card, then create a treasure token.)
If Averon, The Wanderer dies, the season becomes winter (When the season is winter, at the beginning of every players upkeep, all players at the table discard a card and lose 1 life.)