msem-instigator

When Bizarre Dreams enters, destroy up to one target artifact or enchantment.
{3}{W}, Sacrifice Bizarre Dreams: Create two 1/1 blue Elemental creature tokens with flying. They can't block this turn.

Whenever equipped creature attacks or blocks, it gets +3/+3 and gains hexproof until end of turn.
Equip {1}

Flying
Whenever you scry, tap target creature you don't control.

{T}: Scry 1.
{1}{U}, {T}: Reveal the bottom card of your library. If it's an artifact or enchantment card, put it into your hand.

When Chimera Graft dies, manifest the bottom card of your library. (To manifest a card, put it onto the battlefield face down as a 2/2 creature. Turn it face up any time for its mana cost if it's a creature card.)

Whenever Shianne's Guardian or another creature you control enters, you may pay {1}{R}{G}. When you do, that creature deals damage equal to its power to any target.

{R}: Draconic Aspirant gets +1/-1 until end of turn.

Vigilance
Other Scouts you control get +1/+1 and have vigilance.
{X}, Tap four untapped Scouts you control: Create an X/X green Beast creature token.

Enchant creature
When Feline Furor enters, it deals 2 damage to enchanted creature.
Enchanted creature gets +2/+0 and has menace.

Exile target creature you control, then return that card to the battlefield under your control. Scry 1.

Slipstream (This creature can't be blocked as long as only creatures with slipstream are attacking.)
Whenever Conchhorn Shinygrabber attacks, you may pay {1}. If you do, create a Treasure token. (It's an artifact with “{T}, Sacrifice this artifact: Add one mana of any color.”)
{W}{U}{B}{R}{G}: Conchhorn Shinygrabber gets +3/+3 and gains lifelink until end of turn.

Flying
Whenever Warden of Lives attacks, you may cast a creature card from your graveyard. If you do, that creature enters tapped and attacking.
If Warden of Lives would die, it phases out instead.

Flying
Whenever Wandering Dragonfly or another creature you control enters, you may draw a card. If you do, discard a card.

When Healing Center enters, you gain 2 life.
{T}: Add {C}.

When Flame Ascetic enters, you may exile up to one instant card and up to one sorcery card from your graveyard. Put a +1/+1 counter on Flame Ascetic for each card exiled this way.

Whenever equipped creature attacks, it gets +2/+2 and gains trample until end of turn.
Equip {2}

Flying, deathtouch, lifelink
Ride {1}{B} ({1}{B}: Transform this and attach it to target creature you control without a Steed. Ride only as a sorcery.)
You may activate Bonescourge Kazadrak's ride ability from your graveyard by sacrificing a creature in addition to paying its other costs.

Oathbreaker Orc attacks each combat if able.
Whenever Oathbreaker Orc attacks, it deals 2 damage to defending player unless that player sacrifices a permanent.

Haste
Erratic (When this creature dies, reveal the top four cards of your library. Put a creature card that costs less than this revealed this way onto the battlefield and the rest on the bottom of your library in any order.)

Destroy target face-up creature.

Creature cards in your graveyard have revive. The revive cost is equal to their mana cost. (Pay that creature's mana cost, Exile that card from your graveyard: Create a token that's a copy of it except it has no mana cost. Revive only as a sorcery.)

Vanishing 3 (This permanent enters with three time counters on it. At the beginning of your upkeep, remove a time counter from it. When the last is removed, sacrifice it.)
Whenever a creature dies or a time counter is removed from Mourn the Lost, you may tap target creature.

Choose a card name, then reveal the top five cards of your library. You may put a card with the chosen name into your hand. Put the rest on the bottom of your library in any order.
Draw a card.

Whenever one or more cards leave your graveyard for the first time each turn, each player loses 1 life and you draw a card.

Flying
At the beginning of your end step, untap another target creature you control.