Yuriko, the Tiger's Shadow

Commander ninjutsu {U}{B} ({U}{B}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand or the command zone tapped and attacking.)
Whenever a Ninja you control deals combat damage to a player, reveal the top card of your library and put that card into your hand. Each opponent loses life equal to that card's mana value.

Arcane Signet

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

Sky Diamond

Thought Vessel

You have no maximum hand size.
{T}: Add {C}.

Sol Ring

Dimir Signet

Charcoal Diamond

Charcoal Diamond enters tapped.
{T}: Add {B}.