Commander creatures you own have menace and "This creature gets +X/+0, where X is the number of creature cards in your graveyard." (A creature with menace can't be blocked except by two or more creatures.)

Deathtouch When this creature enters, you may mill two cards. (You may put the top two cards of your library into your graveyard.)

{T}, Mill a card: Add {C}. (To mill a card, put the top card of your library into your graveyard.)

Whenever one or more cards are put into your graveyard from your library, this creature gets +1/+1 until end of turn and can't be blocked this turn. {1}{U}{B}: Mill a card.

When this creature enters, surveil 2. (Look at the top two cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.) Whenever an opponent draws their second card each turn, you may return this card from your graveyard to your hand.

Whenever a player casts a blue spell, you may pay {1}. If you do, target player mills two cards.

When this creature enters, mill three cards. You may put a noncreature, nonland card from among the cards milled this way into your hand. If you don't, put a +1/+1 counter on this creature. (To mill a card, put the top card of your library into your graveyard.)

Whenever this creature deals combat damage to a player, you mill two cards. {1}{B}: This creature gets +2/+2 until end of turn. Activate only once each turn.

Whenever this creature becomes untapped, you may pay {2}. If you do, draw a card. Whenever an opponent casts a spell from anywhere other than their hand, draw a card. Discard a card: This creature can't be blocked this turn.

Flying When this creature enters, mill four cards. You gain 1 life for each creature card milled this way. (To mill four cards, put the top four cards of your library into your graveyard.)

Landfall — Whenever a land you control enters, target player mills three cards.

{T}, Mill a card: Add {C}. (To mill a card, put the top card of your library into your graveyard.)

Deathtouch When this creature enters, mill two cards and you gain 2 life. (To mill a card, put the top card of your library into your graveyard.)

Flying Whenever this creature attacks, surveil 1. (Look at the top card of your library. You may put it into your graveyard.)

Whenever another blue creature you control enters, target player mills two cards.

Menace Whenever another creature you control with power 2 or less enters, surveil 1. (Look at the top card of your library. You may put it into your graveyard.)

When this creature enters or dies, mill three cards. (Put the top three cards of your library into your graveyard.)

When this creature enters, mill three cards. (Put the top three cards of your library into your graveyard.) When this creature dies, you may exile it. When you do, return target creature card from your graveyard to your hand.

Defender (This creature can't attack.) When this creature enters, target player mills four cards. (They put the top four cards of their library into their graveyard.)

Hideaway 5 (When this enchantment enters, look at the top five cards of your library, exile one face down, then put the rest on the bottom in a random order.) At the beginning of your upkeep, you may mill three cards. Then if there are twenty or more cards in your graveyard, you may play the exiled card without paying its mana cost.

Mill two cards. Draw a card.

Each player mills four cards. Return up to two instant and/or sorcery cards from your graveyard to your hand. Exile Bond of Insight.