Kozilek

Each player sacrifices all permanents they control that are one or more colors.

When you cast this spell, you may return target creature card from your graveyard to the battlefield.

Annihilator 2 (Whenever this creature attacks, defending player sacrifices two permanents of their choice.)

This artifact doesn't untap during your untap step.

{T}: Add {C}{C}{C}.

{3}: Untap this artifact.

When you cast this spell, you may search your library for a colorless creature card with mana value 7 or greater, reveal it, then shuffle and put that card on top.

The first creature spell you cast each turn costs {2} less to cast.

This spell costs {1} less to cast for each card type among cards in your graveyard.

When you cast this spell, you gain control of target opponent during that player's next turn. After that turn, that player takes an extra turn.

Flying, trample, protection from instants

Untap this creature during each other player's untap step.

{T}: This creature deals 1 damage to any target.

{C}, {T}: Target creature can't attack or block this turn.

{C}{C}, {T}: Draw a card.

Trample

Whenever this creature deals combat damage to a player, you may cast your commander from the command zone without paying its mana cost. (You still pay any additional costs.)

{T}: Add {C}{C}.

{2}, {T}, Sacrifice this artifact: Draw two cards.

Annihilator 2 (Whenever this creature attacks, defending player sacrifices two permanents of their choice.)

Whenever an opponent sacrifices a nontoken permanent, put that card onto the battlefield under your control.

{T}: Add {C}{C}.

When you cast this spell, draw four cards.

Annihilator 4 (Whenever this creature attacks, defending player sacrifices four permanents of their choice.)

When Kozilek is put into a graveyard from anywhere, its owner shuffles their graveyard into their library.

When you cast this spell, if you have fewer than seven cards in hand, draw cards equal to the difference.

Menace

Discard a card with mana value X: Counter target spell with mana value X.

Equipped creature has haste and shroud. (It can't be the target of spells or abilities.)

Equip {0}

{T}: Add {C}.

{1}, {T}, Sacrifice this artifact: Draw a card.

When you cast this spell, target opponent exiles the top four cards of their library, then you may put any number of land cards that player owns from exile onto the battlefield under your control.

{T}: Add {C}{C}.

{T}: Add {C}{C}.

You have no maximum hand size.

{T}: Add {C}.

{T}: Add {C}{C}{C}.

When you cast this spell, exile two target permanents.

Indestructible

Whenever Ulamog attacks, defending player exiles the top twenty cards of their library.

Your opponents can't cast spells with even mana values. (Zero is even.)

Your opponents can't block with creatures with even mana values.

{1}, {T}: Untap target artifact.