Seed Guardian

Reach
When Seed Guardian dies, create an X/X green Elemental creature token, where X is the number of creature cards in your graveyard.

Pioneer Masters

It is a reminder that spring will always follow winter.

Oath of the Gatewatch

Reach
When Seed Guardian dies, put an X/X green Elemental creature token onto the battlefield, where X is the number of creature cards in your graveyard.

Once the Elemental is created, the number of creature cards in your graveyard changing won’t cause the Elemental’s power or toughness to change.

Use the number of creature cards in your graveyard as the ability resolves to determine the value of X. Seed Guardian will count toward this number as long as it’s still in your graveyard at that time.