msem-instigator

{2}{G}, Sacrifice Derrivan Beast Tracker: Create a 3/3 green Beast creature token.

When Derrivan Brawnmage enters, target creature gets +3/+3 and gains trample until end of turn.

Trample
When Descendant of Shimaru enters, 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.”)

Descended Gorge enters tapped.
{T}: Add {R} or {G}.
Morph {2} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I, II — Create a 3/3 green Elk creature token.
III — Scry X, where X is the number of Elk you control, then draw a card.
Revive {6}{G} ({6}{G}, Exile this card from your graveyard: Create a token that's a copy of it, except it has no mana cost. Revive only as a sorcery.)

Destroy target artifact or land.
Kindle 2—{R}, Sacrifice an artifact or land. ({R}, Sacrifice an artifact or land, Exile this card from your graveyard: Create two 1/1 colorless Elemental creature tokens. Kindle only as a sorcery.)

Destroy each artifact with mana value X or less, then create an Idol token for each artifact destroyed this way. (It's an artifact with “{1}, Sacrifice this artifact: Put a +1/+1 counter on target creature. Activate only as a sorcery.”)

When Desert Bloom enters, you gain 4 life.
At the beginning of your upkeep, add {G}{G}.

Desert Storm deals 6 damage to target creature.

Prowess
At the beginning of combat on each of your turns, you may draw a card. If you do, discard a card.

Desert Temple enters tapped.
As Desert Temple enters, an opponent of your choice chooses Oasis or Desiccation.
• Oasis — {T}: Add one mana of any color.
• Desiccation — {T}: Add {C}{C}. You lose 1 life.

Create two 1/1 red and white Sand Warrior creature tokens.

Desert Wurms can't be blocked by creatures with flying.
When Desert Wurms enters, create two 6/6 red Wurm creature tokens with “This creature can't be blocked by creatures with flying.”
When Desert Wurms is put into a graveyard from anywhere, shuffle it into its owner's library.

{T}: Add {C}.
{T}: Add one mana of any color. Spend this mana only to cast riddle spells.
{1}, {T}: Add one mana of any color.

Gain control of target creature until end of turn. Untap that creature. It gains haste and menace until end of turn.

Reveal the top four cards of your library. You may put a creature card and/or a land card from among them into your hand. Put the rest into your graveyard.

When Desperate Botanist enters, create a 0/1 green Plant creature token with “{T}: Add {G}.”
{5}{G}: Transform Desperate Botanist. Activate only if it's attacking.

Target opponent may have Desperate Contrition deal 4 damage to them. If that player doesn't, you draw three cards.
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.)

Sacrifice a land: Desperate Ravager gets +2/+0 and gains haste until end of turn.

Haste
Whenever Desperate Reconnoiterer becomes untapped, scry 1.

Siphon (Each -1/-1 counter you put on your creatures up to their remaining toughness while casting this pays for {1}.)
Search your library for up to two Forest cards, reveal those cards, put one onto the battlefield tapped and the other into your hand, then shuffle.

Target creature you control deals damage equal to its power to target creature or planeswalker you don't control. Scry 1.

When Destiny Beyond Measure enters, tap each creature you control.
Creatures you control get +8/+8 and have “This creature enters tapped.”

Each opponent sacrifices an artifact, an enchantment, and a creature with flying.

When Detritus Scourge enters, you mill eight cards. Put a +1/+1 counter on Detritus Scourge for each creature card milled this way.