msem-instigator

{T}, Sacrifice Ilhus, Knight of Zarad: Destroy all creatures.

Whenever a creature you control dies, put a soul counter on Hill of Souls.
{T}: Add {C}.
{T}, Remove a soul counter from Hill of Souls: Add one mana of any color.

Whenever Scathing Critics deals combat damage to a player or planeswalker, put a +1/+1 counter on it.

Enchant player
When Curse of Fangs enters, gain control of target creature enchanted player controls. It becomes a Vampire in addition to its other types.
Creatures attacking enchanted player have lifelink.

Trample
Evergrowing Hydra enters with X +1/+1 counters on it.
Whenever another creature you control dies, you may pay {X}, where X is less than or equal to that creature's power. If you do, put X +1/+1 counters on Evergrowing Hydra.

({T}: Add {R} or {W}.)
Rugged Fields enters tapped.
Cycling {2} ({2}, Discard this card: Draw a card.)

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

Whenever you cast an enchantment spell, you may put target creature on the bottom of its owner's library.

Hexproof
When Wary Watchkeeper enters, target player mills three cards.

Enchant creature
You control enchanted creature.
At the beginning of your upkeep, enchanted creature's owner may have you draw three cards. If they do, sacrifice Take For Ransom.

When Fang of Andazir enters, each player sacrifices a permanent.
Whenever you sacrifice a creature for the first time each turn, create a 1/1 red Dog creature token.

{G}{G}, {T}: Create a token that's a copy of target creature you control that entered this turn, except it's an artifact in addition to its other types.

Whenever you cast a noncreature spell, Prowling Frost-Tiger gets +1/+1 and gains hexproof until end of turn.

Whenever a player casts a spell, put a doom counter on Foreboding Presence.
At the beginning of each player's end step, if no spells were cast this turn, sacrifice Foreboding Presence. It deals damage equal to the number of doom counters on it to that player.

Draw two cards.
Menagerie — If there are five or more creature types among creatures you control, draw three cards instead.

({T}: Add {R} or {G}.)
Flourishing Crevasse enters tapped unless you control a basic Mountain or a basic Forest.

Vigilance
Whenever Keeper of the Bloodline and at least two other creatures attack, creatures you control get +1/+1 until end of turn.

Whenever you cast a spell for an alternate cost, create two 1/1 red Elemental creature tokens. (This includes “without paying its mana cost.”)
Whenever you cast a red spell from your hand, reveal the top card of your library. If that card has a lesser mana value, you may cast it without paying its mana cost. Otherwise, draw a card, then discard a card.

Flying
Whenever Haerthach, the Wight King deals combat damage to a player, you may sacrifice another creature. When you do, create a 1/1 white Spirit creature token with flying. Return the sacrificed card to the battlefield tapped and under your control at the beginning of the next end step.

Trample
If a creature in Imperial Guardian's pack would deal damage to a permanent or player, it deals twice that much damage instead. (Two or more creatures you control with equal power are in a pack.)

Target creature gets -1/-1 until end of turn. If that creature is tapped, it gets -3/-3 until end of turn instead.

Flourishing Forest enters tapped.
As Flourishing Forest enters, choose a basic land type.
Flourishing Forest is the chosen type in addition to its other types.

Harvest (You may tap any number of creatures you control as you cast this spell. If you do, reduce this spell's mana cost by their total power.)
Search your library for a basic land card, put it onto the battlefield tapped, then shuffle. You gain 3 life.

[+1]: Whenever a creature you control attacks this turn, Aleryn, Dungeon Disabler deals 1 damage to the defending player.
[–1]: Add X mana in any combination of {R} and/or {G}, where X is the number of creatures you control.
[–6]: You get an emblem with “Whenever a player casts a spell, this emblem deals 3 damage to any target.”

{B}{G}, {T}: Reveal the bottom card of your library and exile it. Target creature gets +X/-X until end of turn, where X is that card's mana value.