Sol Ring

Simic Signet

Izzet Signet

Arcane Signet

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

Counterspell

Negate

Exotic Orchard

{T}: Add one mana of any color that a land an opponent controls could produce.

Dive Down

Target creature you control gets +0/+3 and gains hexproof until end of turn. (It can't be the target of spells or abilities your opponents control.)

Arcane Denial

Counter target spell. Its controller may draw up to two cards at the beginning of the next turn's upkeep.
You draw a card at the beginning of the next turn's upkeep.

Xyris, the Writhing Storm

Flying
Whenever an opponent draws a card except the first one they draw in each of their draw steps, create a 1/1 green Snake creature token.
Whenever Xyris, the Writhing Storm deals combat damage to a player, you and that player each draw that many cards.

Artistic Refusal

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.)
Choose one or both —
• Counter target spell.
• Draw two cards, then discard a card.

Command Tower

Horrid Vigor

Target creature gains deathtouch and indestructible until end of turn.

Cancel

Fellwar Stone

Poison the Blade

Target creature gains deathtouch until end of turn.
Draw a card.

Gruul Signet

Gift of the Viper

Put a +1/+1 counter, a reach counter, and a deathtouch counter on target creature. Untap it.