Command Tower

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

Arcane Signet

Deathtouch
Whenever another creature you control enters, you gain 1 life.
Whenever another creature you control dies, each opponent loses 1 life.

Whenever Cruel Celebrant or another creature or planeswalker you control dies, each opponent loses 1 life and you gain 1 life.

{T}: Add {C}.
{T}: Add {W} or {B}. Caves of Koilos deals 1 damage to you.

Destroy target artifact, enchantment, or planeswalker.

Sacrifice another creature or artifact: Put a +1/+1 counter on Bartolomé del Presidio.