msem-instigator

Whenever you gain life for the first time each turn, reveal the top card of your library. If it's a land or creature card, put it into your hand. Otherwise, put it into your graveyard.

Whenever you sacrifice one or more permanents, put a +1/+1 counter on Marsh Dweller.

Trample
Whenever you cast a spell with more colors than the number of counters on Martoob Beastkeeper, put a +1/+1 counter on Martoob Beastkeeper.

Flash
Reach
Whenever Mattia enters or becomes tapped, put a +1/+1 counter on target creature you control.
{2}{G}, {T}: Target creature must be blocked this turn if able. Activate only as a sorcery.

Deathtouch

When Mul Daya Elder enters, search your library for a basic land card, put it onto the battlefield tapped, then shuffle.
Whenever a land you control enters, put a +1/+1 counter on Mul Daya Elder.

{T}: You may put a land card from your hand onto the battlefield.
{1}, {T}: Aetherize target land you control. (To aetherize, create a token that's a copy of it, then exile that token.)

Hexproof
When Overburdened Trader enters, create three 1/1 colorless Construct artifact creature tokens.

Trample
Overgrown Spellroot gets +1/+1 for each creature token you control.
When Overgrown Spellroot enters, create four 1/1 black Worm creature tokens.

When Petal Scatterer enters, create a green Aura enchantment token named Blossom attached to target land. It has enchant land and “Enchanted land has ‘{T}: Add {G}{G}.'”
Petal Scatterer gets +1/+1 for each noncreature, nonland permanent you control.

When Phasmopillar enters, search your library for a creature card with mana value 5 or greater, reveal it, put it into your hand, then shuffle. If a creature card with mana value 9 or greater was revealed this way, put two +1/+1 counters on Phasmopillar.

{T}, Exile a land card from your hand, from your graveyard, or a land that you control: Add one mana of any color.

When Powercell Engineer enters, create a tapped colorless Powercell artifact token with “{T}: Add {C}.”

When Prophet of Reclamation dies, mill three cards, then return up to one land card from your graveyard to your hand.

Trample
Resolute — {G}: Prowling Agamid gets +3/+3 until end of turn. Activate only once each turn and only if Prowling Agamid's power is greater than its base power.

Hexproof (This creature can't be the target of spells or abilities your opponents control.)

{1}{G}: Rhudai Pathfinder gets +X/+X until end of turn, where X is the number of differently named lands you control. Activate only once each turn.

Vigilance
{3}{G}, {T}: Target creature you control fights target creature you don't control.

Artifacts and lands enter tapped.

{T}, Sacrifice a creature: Conjure a card named Data-Point into your hand. Activate only as a sorcery. (It's a sorcery that costs {2} with “Draw a card.”)

Deathtouch

When Savage Savant enters, create a 4/4 green Beast creature token.

Whenever another creature you control enters, if its power is greater than Scalebruiser's power, put a +1/+1 counter on Scalebruiser.
As long as Scalebruiser's power is 4 or greater, each other creature you control enters with an additional +1/+1 counter on it.

Seafoam Slasher gets +1/+1 and has deathtouch as long seven or more cards are in your graveyard.
Cycling {2} ({2}, Discard this card: Draw a card.)

As long as you control four or more lands, Seeker of Untouched Beauty gets +2/+2 and has trample.
When Seeker of Untouched Beauty dies, you may search your library for a basic land card, put it onto the battlefield tapped, then shuffle.