Open the Armory

Search your library for an Aura or Equipment card, reveal it, put it into your hand, then shuffle.

Elmar, Ulvenwald Informant

Haste
Whenever you cast your second spell each turn, untap target creature, then investigate. (Create a colorless Clue artifact token with "{2}, Sacrifice this artifact: Draw a card.")
Friends forever (You can have two commanders if both have friends forever.)

One of the Pack

At the beginning of each upkeep, if a player cast two or more spells last turn, transform this creature.

Solitary Hunter

At the beginning of each upkeep, if no spells were cast last turn, transform this creature.

Solitary Hunter // One of the Pack

Eerie Interlude

Exile any number of target creatures you control. Return those cards to the battlefield under their owner's control at the beginning of the next end step.

Wernog, Rider's Chaplain

When Wernog, Rider's Chaplain enters or leaves the battlefield, each opponent may investigate. Each opponent who doesn't loses 1 life. You investigate X times, where X is one plus the number of opponents who investigated this way.
Friends forever (You can have two commanders if both have friends forever.)

Farbog Revenant

Skulk (This creature can't be blocked by creatures with greater power.)
Lifelink (Damage dealt by this creature also causes you to gain that much life.)

Savvy Hunter

Whenever this creature attacks or blocks, create a Food token. (It's an artifact with "{2}, {T}, Sacrifice this token: You gain 3 life.")
Sacrifice two Foods: Draw a card.

Vexing Devil

When this creature enters, any opponent may have it deal 4 damage to them. If a player does, sacrifice this creature.

Command Tower

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

Ruby, Daring Tracker

Haste (This creature can attack and {T} as soon as it comes under your control.)
Whenever Ruby attacks while you control a creature with power 4 or greater, Ruby gets +2/+2 until end of turn.
{T}: Add {R} or {G}.

Arcane Signet

Angelic Purge

As an additional cost to cast this spell, sacrifice a permanent.
Exile target artifact, creature, or enchantment.

Reduce to Ashes

Reduce to Ashes deals 5 damage to target creature. If that creature would die this turn, exile it instead.

Sol Ring

Rabid Bite

Target creature you control deals damage equal to its power to target creature you don't control.