msem-instigator

({T}: Add {G}.)
Savage Sanctuary enters the battlefield tapped with two sanctum counters on it.
{T}, Remove a sanctum counter from Savage Sanctuary: Add {R} or {W}.

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

Vigilance
Cat creatures you control have vigilance.
When Savannah Scout enters the battlefield, create a 2/2 white Cat creature token.

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.

Prowess
Whenever you cast a noncreature spell, you may choose target permanent with one or more time counters on it, then put a time counter on it or remove a time counter from it.

{3}{G}: Scaled Devestator gets +1/+1 and gains trample until end of turn.

When Scaled Lurker enters the battlefield, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step.

{R}, Discard a card: Target creature blocking Scaled Mindreaver gains winnow until end of turn. (Damage dealt to it also causes its controller to lose that much life.)

Haste
When Scaled Thundercaller enters the battlefield, target creature gains winnow until end of turn. (Damage dealt to it also causes its controller to lose that much life.)

Poisonous 4 (Whenever this creature deals combat damage to a player, that player gets four poison counters.)
At the beginning of combat on each of your turns, if an opponent is poisoned, creatures you control gain trample until end of turn.

Remove a -1/-1 counter from target creature. That creature gets +2/+2 until end of turn.

{2}{G}: Scarred Brawler gets +2/+2 until end of turn.

Exile target creature. Return that card to the battlefield under its owner's control at the beginning of the next end step.

Attacking creatures get -3/-0 until end of turn.

As Scorched Copse enters the battlefield, you may tap an untapped creature you control. If you don't, Scorched Copse enters the battlefield tapped.
{T}: Add {R} or {G}.

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
Scorchland Vandal attacks each combat if able.

Engorge (As this enters the battlefield, mill three cards, then exile a card from among the milled cards.)
When Scourge of the Deadlands enters the battlefield, if it engorged a creature card, each other player sacrifices a creature.

Reveal the bottom four cards of your library. Choose up to one permanent card with mana value 3 or less from among them and put it onto the battlefield. Put the rest on the bottom of your library in any order.

When Scrapgear Contraption dies, you may put a +1/+1 counter on target creature.

Look at the top X cards of your library, where X is the number of instant and sorcery cards in your graveyard. You may reveal an instant or sorcery card from among them and put it on top of your library. Then put the rest on the bottom of your library in a random order.

When Scrapyard Aberration enters the battlefield, you may sacrifice another artifact. If you do, target creature gets -2/-2 until end of turn.

When Scribal Puppeteer enters the battlefield, create two 1/1 black Puppet creature tokens with “At the beginning of your upkeep, you lose 1 life.”

When Scrivener of Sha'Iv enters the battlefield, draw a card and adjudicate. (Create a white Aura enchantment token with enchant creature and “Sacrifice this token: Untap enchanted creature” attached to target creature.)

Haste
Frenzy 2 (Whenever this creature attacks and isn't blocked, it gets +2/+0 until end of turn.)

Play with the top card of your library revealed.
You may cast Elemental spells from the top of your library.