Mirror Entity Avatar

: Choose a creature type. Until end of turn, creatures you control of the chosen type have base power and toughness X/X and gain all creature types.

Arcanis, the Omnipotent Avatar

, Return a creature you control with converted mana cost X to its owner’s hand: Draw a number of cards chosen at random between 0 and X. X can’t be 0.

Momir Vig, Simic Visionary Avatar

, Discard a card: Create a token that’s a copy of a creature card with converted mana cost X chosen at random. Activate this ability only any time you could cast a sorcery and only once each turn.

Enigma Sphinx Avatar

Whenever you cast a colored artifact spell for the first time each turn, search your library for a colored artifact card chosen at random whose converted mana cost is less than that spell’s converted mana cost. You may play that card without paying its mana cost. If you don’t, put that card on the bottom of your library.

Akroma, Angel of Wrath Avatar

Whenever a creature enters the battlefield under your control, it gains two abilities chosen at random from flying, first strike, trample, haste, protection from black, protection from red, and vigilance.

Malfegor Avatar

Whenever a creature enters the battlefield under your control, if it was unearthed, it gets +3/+0.
Whenever a creature you control is exiled, if it was unearthed, shuffle that card into its owner’s library.

Higure, the Still Wind Avatar

Whenever a nontoken creature you control deals combat damage to an opponent, choose a creature card at random from your library, reveal that card, and put it into your hand. Then shuffle your library.