msem-instigator

Prowess
{3}{R}, Sacrifice Goblin Experimenter: Return target sorcery card from your graveyard to your hand.

Advance {4}{B}{B} (Cast this for {4}{B}{B} to advance it as it enters. {4}{B}{B}: Advance this as a sorcery.)
Flying
Whenever Valinov Siphoner advances, target player loses 2 life and you gain 2 life.

Equipped creature gets +2/+2 and has protection from white and from blue.
Whenever equipped creature deals combat damage to a player, until your next turn, spells that player casts cost {1} more to cast and spells you cast cost {1} less to cast.
Equip {2}

Null Bit deals 3 damage to any target.
You may discard a card. If you do, draw a card.

Flying, menace

Activated abilities of nonland permanents cost {2} more to activate.

Return up to one target creature card from your graveyard to your hand.
Recruit. (Create a 0/0 white Soldier Army creature token, then put a +1/+1 counter on each Army you control.)

As an additional cost to cast this spell, put two -1/-1 counters on a creature you control.
Draw two cards.

Draw a card.
Whenever Seek Guidance is put into your graveyard from your hand or library, scry 2. (This doesn't include being cast.)

When Restless Explorer enters, search your library for a land card, reveal it, put it into your hand, then shuffle.

Target creature gets +1/+0 and gains first strike until end of turn. Put a deathtouch counter on it.

Starting with you, each player may sacrifice a creature. Each player that doesn't loses life equal to the total power of creatures sacrificed this way.

Enchant player
At the beginning of enchanted player's upkeep, they choose one —
• That player reveals their hand and discards a card.
• That player discards a card at random.

Enchant creature you control
When Rapacious Instinct enters, enchanted creature deals damage equal to its power to target creature you don't control.
Enchanted creature gets +1/+0.

Until end of turn, gain control of target creature and it gains haste and shimmer. Untap it. (Whenever it attacks this turn, create a tapped and attacking token that's a copy of it. Exile that token at the beginning of the end step.)

Trample, haste
When Rejuvenating Elemental enters, remove up to X -1/-1 counters from among creatures you control. Rejuvenating Elemental gets +1/+1 until end of turn for each counter removed this way.

At the beginning of your upkeep, you lose life equal to the number of Armies you control, then recruit. (Create a 0/0 white Soldier Army creature token, then put a +1/+1 counter on each Army you control.)

Trample
Volcanic Terror gets +1/+1 for each land card in all graveyards and in exile.

Whenever Guided Medic attacks, upgrade it. (Give it one of the listed counters it doesn't already have.)
• +1/+1
• Lifelink

Destroy target nonland permanent. If it had flying, put a flying counter on a creature you control. Do the same for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, menace, reach, trample, and vigilance.

First strike
Whenever you scry, Battlewise Paragon gets +1/+1 until end of turn for each card you looked at while scrying this way.

This spell costs {X} less to cast, where X is the greatest power among creatures you control.
Abandon Life and Hope deals 5 damage to target creature or planeswalker.

Abomination Sculptor has deathtouch and lifelink as long as it's attacking.

{2}{U}: Target creature can't be blocked this turn.

{X}{X}, {T}: Draw X cards, then choose X cards in your hand and discard the rest.