Great Oak Guardian

Flash (You may cast this spell any time you could cast an instant.)
Reach
When Great Oak Guardian enters, creatures target player controls get +2/+2 until end of turn. Untap them.

Seedborn Muse

Untap all permanents you control during each other player's untap step.

Svella, Ice Shaper

{3}, {T}: Create a colorless snow artifact token named Icy Manalith with "{T}: Add one mana of any color."
{6}{R}{G}, {T}: Look at the top four cards of your library. You may cast a spell from among them without paying its mana cost. Put the rest on the bottom of your library in a random order.

Magewright's Stone

{1}, {T}: Untap target creature that has an activated ability with {T} in its cost.

Forest

Mountain

Second Harvest

For each token you control, create a token that's a copy of that permanent.