msem-instigator

Haste
Whenever Eager Guide attacks, tap up to two target creatures you don't control.

First strike (This creature deals combat damage before creatures without first strike.)

Creatures you control enter with a +1/+1 counter on them if you spend three or more colors of mana to cast them.

First strike
Sacrifice Echo Striker: Target creature gains double strike until end of turn.

If a spell or ability an opponent controls causes you to discard Edgar, put it onto the battlefield instead of putting it into your graveyard.
Unveil {4}{G}{W} ({4}{G}{W}: Transform this. Unveil only as a sorcery.)

When Edina's Soulsinger enters, create a 1/1 blue Jellyfish enchantment creature token with slipstream. (It can't be blocked as long as only creatures with slipstream are attacking.)

Trample
Effigy of Harvest gets +1/+1 as long as your fealty to Forests is four or greater. (Each Forest you control counts towards your fealty to Forests.)

When Ekebram's Scribe enters, scry 2. (Look at the top two cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.)

Whenever Hatsuo attacks, if you control three or more attacking creatures, attacking creatures you control gain first strike until end of turn.
Inspired — Whenever Hatsuo becomes untapped, create a 1/1 white Warrior creature token. It gains haste and attacks this turn if able.

Whenever Chian becomes the target of a spell or ability you control, create a 2/2 blue Drake creature token with flying. This ability triggers only once each turn.

When Elemental Loremaster enters, return an instant or sorcery card at random from your graveyard to your hand.

Flash
{U}, Put Elusive Hunter into its owner's library second from the top: Counter up to one target spell unless its controller pays {2}.

Foresight — Whenever you draw your second card each turn, Elusive Sage can't be blocked this turn.

{1}: Look at the top card of your library.
{G}, {T}, Mill a card: Untap another target creature.

Elfcycling {2}{G} ({2}{G}, Discard this card: Search your library for an Elf card, reveal it, and put it into your hand, then shuffle.)

Whenever Elvish Wayfinder enters or attacks, reveal the top four cards of your library. You may put a land card that doesn't share a name with a land you control into your hand. Put the rest on the bottom of your library in any order.

Haste
At the beginning of your upkeep, sacrifice Ember of Ancient Infernos unless you pay {R}.

Prowess, haste
When Embercore Grazer enters, add {R}{R}{R}. Spend this mana only to cast instant and/or sorcery spells.

Haste, prowess
{3}{R}, {T}, Sacrifice Emberheart Arcanist: Return target instant or sorcery card from your graveyard to your hand.

Colossal 2—{3}{R} (You may cast this for its colossal cost to have it enter with two +1/+1 counters; or pay {3}{R} as a sorcery: Put two +1/+1 counters on it if it has none.)
When Emberhound's colossal ability puts one or more counters on it, target creature can't block this turn.

Haste
Whenever Emblazoned Qilin attacks, it gains flying until end of turn if it's in a pack. (Two or more creatures you control with equal power are in a pack.)

Haste
Other Elementals you control get +1/+0 and have haste.

At the beginning of combat on your turn, create a 1/1 red Nomad creature token with haste.
At the beginning of your upkeep, if you control five or more creatures, you may transform Emerabi and Sunnula.

Trample
Assault {2}{R}{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.)
If one or more +1/+1 counters would be put on a creature you control, that many plus one +1/+1 counters are put on it instead.

Menace, haste