msem-instigator

When Bubbledome Chorister enters, create a green Aura enchantment token named Sanctum's Gift attached to target creature. The token has enchant creature and “Enchanted creature has ‘{T}: Add {G} for each enchanted creature you control.'”

Deathtouch
Cadence (Whenever you cast a spell, if its mana value is greater than this creature's power, put a +1/+1 counter on this creature.)

Whenever another creature named Crinster Sheepdog enters, nourish 1. (To nourish 1, either put a +1/+1 counter on this creature or create a 1/1 white Citizen creature token.)

Reach
When Danaj Decider dies, judge another target creature you control. (Honor it by putting a +1/+1 counter on it or condemn it by sacrificing it to draw a card.)

Landfall — Whenever a land you control enters, Duskwood Vanguard gets +1/+1 until end of turn.

When El, Humble Apprentice enters, search your library for a basic land card, reveal it, put it into your hand, then shuffle.
Chosen one ({W}{U}{B}{R}{G}: Transform this permanent.)

Improve {1} ({1}: Put a +1/+1 counter on this creature. This costs {1} more to activate for each +1/+1 counter on it. Improve only as a sorcery.)
{T}: Add one mana of any color.
{T}: Add X mana of any one color, where X is the greatest number of counters among creatures you control.

Whenever another creature you control enters, put your choice of a vigilance, reach, or trample counter on this creature.
{T}, Remove a counter from this creature: Add one mana of any color. If that mana is spent on a creature spell, you may have it enter the battlefield with an additional counter of that kind on it.

Wanderlust — Feral Ornithax gets +2/+2 and has trample as long as you control four or more differently named lands.

You may play lands from your graveyard.
Whenever a land you control enters, create a 1/1 white Peasant creature token.

When Glowskate Channeler enters, create a green Aura enchantment token named Manta's Wings attached to target creature. The token has enchant creature and “Enchanted creature gets +2/+2.”

Whenever you cycle a card, reveal the top two cards of your library. You may put a permanent card from among them into your hand. Put the rest on top of your library in any order or into your graveyard.
Cycling {2} ({2}, Discard this card: Draw a card.)

{T}: Add one mana of any color.
Paranoia {G} (You may cast this spell for its paranoia cost when a permanent you control leaves the battlefield.)

Whenever Hedge Dashers attacks, if you control a permanent with a counter on it, Hedge Dashers gets +1/+1 and gains trample until end of turn.

{1}{U}, {T}: Reveal the top card of your library. If it doesn't share a color with Heretical Seer, put it into your hand.

Flash
When Hidden Sprout enters, put a +1/+1 counter on target creature.

Creatures you control have “{T}: Add {C} or one mana of any of this creature's colors.”
Attain {5}{G} ({5}{G}: Transform this. Spend at least three colors of mana to activate this, and only as a sorcery.)

Trample
Whenever this creature attacks, if you control three or more other creatures, it gets +2/+1 until end of turn.

When Keeper of the Ancient Ways enters, destroy up to three target noncreature, nonland artifacts and/or enchantments with total mana value 3 or less.

Reach
When Klothys's Lookout enters, choose one —
• You gain 3 life.
• Exile target card from a graveyard.
• Return target land card from your graveyard to your hand.

{T}: Add {G} or one mana of any color among cards in your graveyard.

Whenever you cast a creature spell, create an Idol token. (It's an artifact with “{1}, Sacrifice this artifact: Put a +1/+1 counter on target creature. Activate only as a sorcery.”)
Whenever you sacrifice an Idol, draw a card.

{T}: Add one mana of any color.

Other creatures you control get +0/+1.

Reach
When Mawdryk's Harrier enters, look at the top six cards of your library. You may put an Elf card with lesser mana value from among them onto the battlefield. Put the rest on the bottom of your library in a random order.
Other Elves you control get +1/+1.