Arcane Signet

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

Imperial Seal

Search your library for a card, then shuffle and put that card on top. You lose 2 life.

Grumgully, the Generous

Each other non-Human creature you control enters with an additional +1/+1 counter on it.

Vampiric Tutor

Squee, the Immortal

You may cast Squee, the Immortal from your graveyard or from exile.

Slimefoot and Squee

Whenever Slimefoot and Squee enters or attacks, create a 1/1 green Saproling creature token.
{1}{B}{R}{G}, Sacrifice a Saproling: Return Slimefoot and Squee and up to one other target creature card from your graveyard to the battlefield. Activate only as a sorcery.

Food Chain

Exile a creature you control: Add X mana of any one color, where X is 1 plus the exiled creature's mana value. Spend this mana only to cast creature spells.