Command Tower

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

Rosie Cotton of South Lane

When Rosie Cotton enters, create a Food token. (It's an artifact with "{2}, {T}, Sacrifice this token: You gain 3 life.")
Whenever you create a token, put a +1/+1 counter on target creature you control other than Rosie Cotton.

Swords to Plowshares

Exile target creature. Its controller gains life equal to its power.

Arcane Signet

Impact Tremors

Whenever a creature you control enters, this enchantment deals 1 damage to each opponent.

Reckless Fireweaver

Whenever an artifact you control enters, this creature deals 1 damage to each opponent.

Anim Pakal, Thousandth Moon

Whenever you attack with one or more non-Gnome creatures, put a +1/+1 counter on Anim Pakal, then create X 1/1 colorless Gnome artifact creature tokens that are tapped and attacking, where X is the number of +1/+1 counters on Anim Pakal.

Path to Exile

Exile target creature. Its controller may search their library for a basic land card, put that card onto the battlefield tapped, then shuffle.

Luminarch Aspirant

At the beginning of combat on your turn, put a +1/+1 counter on target creature you control.