msem-instigator

First strike
Whenever Zankon, Ema's Claws blocks or becomes blocked, put a +1/+1 counter on each creature you control.

{U}, {T}: You may tap or untap another target creature.
Whenever one or more other creatures you control deal combat damage to a player, you may untap Riverchase Diver.

At the beginning of your end step, if you control two or more tapped creatures, you may exile target creature. If you do, return that card to the battlefield under its owner's control.

Ferocious — At the beginning of your upkeep, if you control a creature with power 4 or greater, draw a card.

Improve {1}{W} ({1}{W}: 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.)
Prevent all combat damage that would be dealt to attacking embattled creatures you control. (A creature is embattled if it has a counter on it or has a permanent you control attached to it.)

Flying, haste

Tap up to three target lands. They don't untap during their controller's next untap step.
Agonize (You may cast this card from your graveyard by putting a -1/-1 counter on a creature you control in addition to paying its other costs. Then exile this card.)

Flying
Whenever Immaculate Clouddasher attacks, up to three target creatures gain flying until end of turn.

Equipped creature gets +4/+4.
You may have equipped creature assign its combat damage as though it weren't blocked. When you do, sacrifice it at end of combat.
Equip {4}

Whenever another Hound you control enters, put a +1/+1 counter on Greypelt Initiate.

You may play enchantment spells from your graveyard if you haven't cast a spell with that name this turn.
At the beginning of your end step, choose up to one enchantment you control. Shuffle the rest into your library.

At the beginning of each end step, if you've cast a noncreature spell this turn, put a +1/+1 counter on Streetwise Spellseeker. Then if its power is 5 or greater, create a 4/4 white Angel Soldier creature token with flying.

Target opponent chooses a creature card in your graveyard. Return the chosen card from your graveyard to your hand.

Stray Sighthound can't be blocked by creatures with power 2 or less.
Attain {3}{G} ({3}{G}: Transform this. Spend at least three colors of mana to activate this, and only as a sorcery.)

Flying
Prismatic — Whenever you cast a multicolored spell, scry 1.

Take an extra turn after this one. During that turn, you may look at and play the top card of your library.
Exile Temporotomy.

Whenever you cast a spell, you may pay {1}. If you do, put a storage counter on Savings Broker.
Remove X storage counters from Savings Broker: Add {C} for each storage counter removed this way. You gain X life.

When Ulek Elder enters, look at the top card of your library. You may put it into your graveyard.

When Gharsha, Monstrous Quarry enters, each opponent creates a 1/1 green Elf creature token.
Whenever a creature you control becomes blocked, you may pay {1}. If you do, put a +1/+1 counter on that creature.

Archive 3 (As this enters, shuffle the top three cards of your main library into a new face up library. Sacrifice this after the archived library is empty.)
Whenever you draw a card from the archived library, put the top card of your main library on the bottom of the archived library.
{B}: Exchange a card from the archived library with a card from your hand.

All creatures able to block Raiun Bay Merchant do so.

Enchant creature
When Knightly Valor enters, create a 2/2 white Knight creature token with vigilance. (Attacking doesn't cause it to tap.)
Enchanted creature gets +2/+2 and has vigilance.

Target opponent sacrifices a creature. Put a +1/+1 counter on up to one target creature you control.

Trample
Tribute 3 (As this creature enters, an opponent of your choice may put three +1/+1 counters on it.)
When Rockpounding Saurian enters, if tribute wasn't paid, you may destroy up to one target artifact, up to one target land and up to one target Fortress.

Flash
Whenever Thundermane Fox enters or attacks, target creature you control gains double strike until end of turn.