msem-instigator

Flying
Whenever another creature you control attacks, you may pay {1}. If you do, put a +1/+1 counter on it.

{T}: Add {W}.
{W}, {T}: Target creature gains vigilance until end of turn.

Mossvine Lurker has trample as long as it has a +1/+1 counter on it.

Kicker {2}{R} (You may pay an additional {2}{R} as you cast this spell.)
Haste (This creature can attack and {T} as soon as it comes under your control.)
If Mountain Victor was kicked, it enters the battlefield with two +1/+1 counters on it.

Exile a nonland card from your graveyard: For each colored mana symbol in that card's mana cost, add one mana of that color. Activate only once each turn. (For example, if the card's mana cost is {3}{G}{G}{W}, you add {G}{G}{W}.)

When Mulchborn Behemoth enters the battlefield, you may sacrifice any number of lands.
Mulchborn Behemoth gets +1/+1 for each land card in your graveyard.
{B}{G}, Sacrifice a land: Destroy target creature or land.

Create two 1/1 white Soldier creature tokens. Prevent all damage that would be dealt to them this turn.

Destroy target artifact or enchantment.
Scry 1.

{G}, Exile a creature card from your graveyard: Put two +1/+1 counters on target creature.

Destroy target artifact or enchantment.

Defender (This creature can't attack.)
When Naturebound Druid enters the battlefield, you may search your library for a basic land card, reveal it, then shuffle and put that card on top.

Target creature gains deathtouch until end of turn. Regenerate it.

Enchant creature
Enchanted creature gets +1/+1.
When enchanted creature dies, you may exile it. If you do, return target creature card from your graveyard to the battlefield.

Equipped creature has all activated abilities of all creature cards in your graveyard.
Equip {3}

As an additional cost to cast this spell, tap an untapped artifact you control.
Target player discards two cards.

Flying (This creature can't be blocked except by creatures with flying or reach.)
{R}: Newborn Dragon gets +1/+0 until end of turn.

Flying (This creature can't be blocked except by creatures with flying or reach.)
{B}: Night Screecher gains deathtouch until end of turn. (Any amount of damage this deals to a creature is enough to destroy it.)

Flying
Whenever an opponent discards a card, put a +1/+1 counter on Nightbane Specter.
Whenever Nightbane Specter deals combat damage to a player, that player discards a card.

Put target nonland permanent on top of its owner's library.
Draw a card.

Flying (This creature can't be blocked except by creatures with flying or reach.)
As long as Nightclad Stalker is enchanted, it gets +1/+0 and has deathtouch and lifelink.

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
Whenever Nimble Elemental deals combat damage to a player, you may draw a card. If you do, discard a card.

Scry X, where X is the number of artifacts you control, then reveal the top card of your library. If it's an artifact card with mana value X or less, put it onto the battlefield. Otherwise, draw a card.

This spell costs {X} less to cast, where X is half the number of creatures on the battlefield, rounded down.
Destroy all creatures.