msem-instigator

Whenever a player casts a spell from their hand, that player exiles it. Then they cast a copy of a card exiled with Embrace the Unpredictable chosen at random without paying its mana cost.

Destroy all nonland, nonenchantment permanents.
Spell mastery — If there are two or more instant and/or sorcery cards in your graveyard, you gain 2 life for each permanent destroyed this way.

Equipped creature gets +1/+1 and has hexproof.
Whenever equipped creature deals combat damage to a player, you may return up to one target instant or sorcery card from your graveyard to your hand.
Equip {3}

When Enhance Armor enters the battlefield, return an enchantment card from your graveyard to your hand.
Whenever you cast an enchantment spell, put a +1/+1 counter on a creature you control.

Flying
Whenever Entali Aeromancer attacks, Elementals you control gain flying until end of turn.

Each player shuffles their hand and graveyard into their library. Then each player draws seven cards. If you didn't control a blue legendary creature or planeswalker as you cast this spell, discard three cards. Exile Entelan Erasure.

When Entelan Savant enters the battlefield, scry 2.

When Esiara, Skycaster's Infiltrator enters the battlefield, exile target spell with mana value 4 or less.
{1}{U}{U}, Discard two cards: Exile Esiara, then return it to the battlefield under your control.
{2}{U}{U}, {T}, Exile Esiara: Until end of turn, you may play cards you don't own from exile.

Counter target creature spell.

Menace
Evanescent Soulcatcher's power and toughness are each equal to the number of cards in exile.
{2}, Exile a card from your hand: Regenerate Evanescent Soulcatcher.

Whenever you play a land, you may put a land card from your hand onto the battlefield tapped.

Create three 1/1 red Elemental creature tokens.

If an opponent controls three or more attacking creatures, you may cast this spell as though it had flash.
Firewall Trap deals 5 damage to target creature. When that creature dies this turn, Firewall Trap deals damage equal to that creature's power to another target creature.

Experience (Whenever this creature attacks, if it has fewer than three +1/+1 counters on it, put a +1/+1 counter on it.)
Whenever a +1/+1 counter is put on Flamerider, you may have it deal damage equal to its power to target creature.

Flamewhip deals 2 damage to each non-Goblin creature.
If you control a Goblin creature, create a 1/1 red Goblin creature token.

When Forest Whale dies, put a number of +1/+1 counters on target creature you control equal to Forest Whale's power.

Forestheart Elemental enters the battlefield with a +1/+1 counter on it for each land you control.

Whenever you cast an artifact spell, create a 1/1 colorless Construct artifact creature token.

Menace
When Fortune Hoarder dies, each player discards a card at random.

Flying
Artifact spells you cast cost {1} less to cast.

{U}{R}, {T}: Fulmen deals 1 damage to target creature. When a creature dealt damage this way dies this turn, draw a card.
Whenever you cast an instant or sorcery spell, if you cast another instant or sorcery spell this turn, exile Fulmen, then return him to the battlefield transformed under his owner's control. He deals 3 damage to each creature.

[+2]: Draw two cards, then discard two cards unless you discard an instant or sorcery card.
[–3]: Reveal any number of cards from your hand. Fulmen deals damage to any target equal to the number of instant and sorcery cards revealed.
[–9]: Search each player's library for up to one instant card and one sorcery card. Cast those cards without paying their mana costs. Then each player shuffles.

Goblin Exploration Team gets +1/+0 for each non-Mountain land you control.

When Goblin Rocktosser enters the battlefield, you may sacrifice a land. If you do, put a +1/+1 counter on Goblin Rocktosser.