Forest

Beastcaller Savant

Haste
{T}: Add one mana of any color. Spend this mana only to cast a creature spell.

Izzet Signet

Island

Birds of Paradise

Simic Signet

Arcane Signet

{T}: Add one mana of any color in your commander's color identity.

Mountain

Primordial Sage

Whenever you cast a creature spell, you may draw a card.

Mulldrifter

Flying
When Mulldrifter enters, draw two cards.
Evoke {2}{U} (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters.)

Beast Whisperer

Whenever you cast a creature spell, draw a card.

Gruul Signet

Sol Ring

Animar, Soul of Elements

Protection from white and from black
Whenever you cast a creature spell, put a +1/+1 counter on Animar, Soul of Elements.
Creature spells you cast cost {1} less to cast for each +1/+1 counter on Animar.

Mox Amber

{T}: Add one mana of any color among legendary creatures and planeswalkers you control.