msem-instigator

Wandering Megaflora has hexproof as long as it's untapped.
Whenever Wandering Megaflora attacks, untap another target creature you control.

Whenever you cast a spell, Wandering Precursor gets +1/+0 until end of turn for each color of mana spent to cast that spell.

Assault {G} (Whenever this attacks, if it has no +1/+1 counters on it, you may pay its assault cost to put a +1/+1 counter on it.)
Whenever a creature you control assaults, it gains indestructible until end of turn.

Vanishing 1 (This creature enters with a time counter on it. At the beginning of your upkeep, remove a time counter from it. When the last is removed, sacrifice it.)
When Waning Behemoth enters, you may pay {X}. If you do, put X time counters on it.

Target attacking creature gains double strike until end of turn. Arm it. (Create a colorless Equipment artifact token with “Equipped creature gets +1/+0” and equip {2}, then attach it to that creature.)

Legacy (You may play this side of this card only from your graveyard. Exile it if it would leave the battlefield or not resolve.)
Whenever you attack, you may discard up to X cards, where X is the number of attacking creatures you control. Draw a card for each card discarded this way.

{T}: Add {C}.
{5}, {T}, Sacrifice War Golem Forge: Create a 3/3 colorless Golem artifact creature token.

Whenever War Priest of Bahet deals combat damage to a player, purge. (Exile two cards that share a type from graveyards. If you do, draw a card.)

Creatures you control get +1/+0 and gain haste until end of turn. (Cast a copy of this spell once while this creature is on the battlefield.)

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I, II — War's Sorrow deals 1 damage to any target.
III — Each player sacrifices another permanent. Put War's Sorrow on top of its owner's library unless a player has it deal 3 damage to them.

War-Pride Champion can't be blocked by creatures with power 2 or less.
Stampede — Whenever War-Pride Champion and a creature with greater power attack, target creature you control gets +2/+2 until end of turn.

{T}: Add {C}.
{1}, {T}, Sacrifice War-Torn Tundra: Arm target creature you control. Activate only as a sorcery. (Create a colorless Equipment artifact token with “Equipped creature gets +1/+0” and equip {2}, then attach it to that creature.)

Glorious end — When Warband Commander dies, if it was tapped, put a +1/+1 counter on each creature you control that attacked this turn.

Haste
Glorious end — When Warband Lieutenant dies, if it was tapped, put a +1/+1 counter on another target creature you control.

Prevent all noncombat damage that would be dealt to equipped creature.
Equipped creature has hexproof as long as it's your turn.
Equip {1}

Motivate 3 (When this creature enters, you may motivate target creature with lesser power than this by putting three +1/+1 counters on it.)
At the beginning of combat on your turn, you may have target creature you control gain vigilance until end of turn.

Whenever you cast an Elf spell, create a 1/1 green Elf Druid creature token.
Tap four untapped Druids you control: Destroy target artifact or enchantment.

Warded Tome doesn't untap during your untap step.
{T}: Draw a card.
{5}: Untap Warded Tome.

Warden of the Fronds' power and toughness are each equal to the number of Forests you control.
Warden of the Fronds has indestructible as long as you control five or more lands.

When Warfan of Changing Winds enters, draw a card.
Whenever a card you own is exiled from anywhere, you may put it on the bottom of your library.

Vigilance
Whenever Warfield Excavator attacks, you may exile target card from a graveyard.
Warfield Excavator gets +1/+1 for each card type among cards exiled with it.

Flying, haste
Whenever Warfury Dragon becomes enchanted or equipped, monstrosity 2. (If this creature isn't monstrous, put two +1/+1 counters on it and it becomes monstrous.)

Trample
Warlord of Wun Su can't block alone.

Equipped creature gets +2/+2 and has haste and trample.
Whenever another creature you control dies, sacrifice equipped creature.
Equip {1}

Each instant and sorcery card in your graveyard gains agonize until end of turn.
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.)