msem-instigator

Whenever another Avatar you control enters, upgrade it and Experienced Mentor. (Give each one of the listed counters it doesn't already have. Upgrades are independent.)
• +1/+1
• First strike
• Vigilance

When Experienced Team enters, choose one —
• Create a 4/2 white Bear creature token.
• Create a 2/4 red Snail creature token.
• Create a 2/2 white Bird creature token with flying.

Flash
You may activate Zero's loyalty abilities any time you could cast an instant on your turn and the turn they entered.
[+2]: Destroy up to one target permanent with mana value 4 or greater.
[–2]: You may cast a spell with mana value 5 or less from your hand without paying its mana cost.
[–3]: Search your library for a card and put it into your hand. Shuffle your library.

Equipped creature gets +2/+2 and has double strike and trample.
Equip {5}

Mill two cards, then you may return a permanent card that was put into your graveyard from anywhere this turn to your hand.

Advance costs you pay cost {1} less.
You may activate advance abilities of permanents you control any time you could cast an instant.

{2}, {T}: Choose a permanent you control. Reveal the top five cards of your library. You may merge one of those cards that shares a card type with the chosen permanent under it. It has those card's abilities. Put the rest on the bottom of your library in any order.

Vanguard — Whenever a creature you control attacks alone, you may put a charge counter on Expert Belt and attach it to that creature.
Equipped creature has hexproof.
Equipped creature gets +1/+0 for each charge counter on Expert Belt.
Equip {2}

Draw three cards. (Then exile this card. You may cast the creature later from exile.)

Enchant creature an opponent controls
Whenever enchanted creature attacks or blocks, fateseal 1. (Look at the top one cards of an opponent's library, then put any number on the bottom and the rest on top in any order.)

You may play an additional land this turn.
Draw a card.

Mill five cards, then return up to one creature card, up to one land card, and up to one noncreature, nonland card from your graveyard to your hand. Exile Explore Forgotten Lands.

At the beginning of your upkeep, choose one. If you control seven or more differently named permanents, choose two instead.
• Draw a card.
• Explore the Multiverse deals 2 damage to target player.
• Create a 1/1 white Scout creature token.

Explorer's Ascent enters tapped.
{T}: Add {W}.
{T}: Target creature you control gets +1/+1 until end of turn.

Enchant opponent
At the beginning of enchanted player's upkeep, you create a 3/2 green Crocodile creature token with trample if enchanted player has 10 or less life. Otherwise, they lose 2 life.

When Explorer's Torch enters, draw a card.
Equipped creature gets +1/+1.
Equip {1}

Each player searches their library for a basic land card, puts it onto the battlefield tapped, then shuffles.

Explosion Fanatic can't attack unless an opponent was dealt damage this turn.

Explosive Implant deals 4 damage to target creature and 2 damage to that creature's controller.

Choose a color. Target player reveals their hand and you choose a card of that color from it. If you do, that player discards that card and you lose 1 life.

This spell costs {2} less to cast if you control an Azra or Demon.
Target creature you control gets +4/+4 and gains trample until end of turn.

Whenever you cast your second spell each turn, Expressive Performer deals 1 damage to each opponent.
{3}{R}, {T}, Exert Expressive Performer: It deals 2 damage to each player. (An exerted creature won't untap during your next untap step.)

Exile target creature.
Draw a card.

Expunge the Terrors deals X damage to target creature or planeswalker.
Madness—{1}{R}, Exile X cards from your graveyard. (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)