msem-instigator

Haste
Whenever a player casts a spell, Rakkiri Dissident deals 1 damage to that player.

Roggar's Frenzy deals 3 damage to any target.
{2}{R}, Exile Roggar's Frenzy from your graveyard: Create two tapped 1/1 red Elemental creature tokens.

Haste
When Speaker of the Iris enters, abound. (To abound, you may cast a spell that costs less than this from your hand without paying its mana cost.)
Other creatures you control have haste.

Prowess, haste

Stormsurge deals 3 damage to any target.
Orchestrate {R} (You may exile this card from your hand anytime you could cast a sorcery for its orchestrate cost. When you next resolve a spell, you may cast this from exile without paying its mana cost.)

Flying
Suisei the Southern Star gets +1/+1 for each comet counter you have.
Whenever you cast an instant or sorcery spell with mana value greater than the number of comet counters you have, you may pay {R}. If you do, return Suisei from your graveyard to the battlefield, then you get a comet counter.

Unceasing Flames deals X damage to any target, where X is 2 plus the number of cards named Unceasing Flames in your graveyard.
Conjure three cards named Unceasing Flames and shuffle them into your main library.

Trample
Wanderlust — Whenever Akkrixian Assailants attacks, if you control four or more differently named lands, put a +1/+1 counter on it.

When Ancient of the Glade enters, put a +1/+1 counter on each other creature you control.
{2}, Remove a +1/+1 counter from a creature you control: That creature gains indestructible until end of turn.

Archive 5 (As this enters, shuffle the top five cards of your main library into a new face up library. Sacrifice this after the archived library is empty.)
You may play lands from the archived library.

Trample
Arpechian Champion can only attack or block alone.
Whenever a land you control enters, put a +1/+1 counter on Arpechian Champion.

Reach, trample
If a +1/+1 counter would be put on another creature you control, instead put a +1/+1 counter on that creature and on Avatar of the Natural.

Target creature gets +4/+4 until end of turn. Create a colorless artifact token named Lotus Petal with “{T}, Sacrifice this artifact: Add one mana of any color.”

Whenever another creature you control dies, put a +1/+1 counter on Deathfeeder.
Sacrifice Deathfeeder: Target creature gets +X/+X until end of turn, where X is Deathfeeder's power.

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

You may play an additional land this turn.
Draw a card.

You may put a creature or land card from your hand onto the battlefield. Then each opponent may put a permanent card from their hand onto the battlefield. If one does, you may repeat this process.

Trample
At the beginning of your end step, if there are two or more +1/+1 counters among creatures you control, return Herald of Might from your graveyard to the battlefield.

Trample
Art of war — At the beginning of your end step, if Imperial Legion dealt damage to an opponent this turn, put two +1/+1 counters on it.

Landfall — Whenever a land you control enters, Landbound Connoisseur gets +1/+1 until end of turn, then you may have another target creature get +X/+X until end of turn, where X is Landbound Connoisseur's power.

Trample
Whenever a land you control becomes tapped, Loamwrecker gets +1/+1 until end of turn.

When Master Chef enters, create a 0/1 green Plant creature token.
Sacrifice a Plant: You gain 3 life.

Destroy target artifact or enchantment. Its controller gains 4 life.

Put a +1/+1 counter on target creature.
Flashback {1}{G} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

When Relentless Pathcutter enters, create a green Aura enchantment token named Enmity attached to target creature. The token has enchant creature and “Enchanted creature gets +2/+0 and has trample.”
When Relentless Pathcutter dies, return it to its owner's hand.