msem-instigator

(Add a quest counter as this enters. Sacrifice after 3.)
1, 2 — Whenever you attack with one or more creatures with power 4 or greater, add a quest counter.
3 — Until end of turn, target creature you control gains trample and “Whenever this creature deals combat damage to a player, put a +1/+1 counter on it.”
Put two +1/+1 counters on target creature you control. It fights up to one target creature you don't control.

Prowess
Gilded Gunman gets +1/+1 as long as you control an artifact.

Flying

As an additional cost to cast this spell, sacrifice a creature.
Search your library for up to X cards and put them into your hand, where X is the sacrificed creature's power, then shuffle.

When Himari enters, put a +1/+1 counter on a creature you control.
Creatures you control with counters on them have base power and toughness 4/4 and have trample.

Inferno Lash deals 2 damage to target creature or planeswalker. When it does, torment that permanent's controller. (They lose 3 life unless they discard a card or sacrifice a nonland permanent.)

When Helicos Octopus enters, scry 1. If an opponent is cursed, scry 3 instead.

Enchant creature
Enchanted creature gets +3/+0 and has trample.
Madness {1}{R} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

Radiant Vistas enters tapped.
{T}: Add {W} or {U}.
{W}{U}, {T}, Sacrifice Radiant Vistas: Conjure a card named Data-Point into your hand. (It's a sorcery that costs {2} with “Draw a card.”)

Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.)
Whenever Master of Ancient Ways mentors a creature, that creature gains double strike until end of turn.

Whenever equipped creature attacks, you may unattach Throwing Stones. When you do, target creature can't block this turn.
Equip {3}

Lands you control have hexproof.
{2}{G}{U}: Rouse 2. (Distribute two +1/+1 counters among permanents you control. If they aren't creatures, tap them and they become 0/0 creatures in addition to their other types.)

Target player loses 3 life. Creatures you control gain menace until end of turn.

Wu Xing (Add effects based on the number of colors of mana spent to cast this spell.)
1 | Return up to two target creature cards from your graveyard to your hand.
3 | You may put a creature card with mana value 3 or less from your hand onto the battlefield.

Put target nonland permanent on top of its owner's library.
Draw a card.

Ferocious — Whenever a creature with power 4 or greater you control enters, you gain 4 life.

Haste
Claret Gorger can't block.
Unveil {2}{B}{R} ({2}{B}{R}: Transform this. Unveil only as a sorcery.)

Encourage ({T}: Another target creature you control gets +1/+1 until end of turn. Encourage only as a sorcery.)
Whenever Topan Curemaster encourages a creature, you gain 1 life.

When Data Smuggler enters, if an opponent is cursed, exile the top card of your library. You may play that card until the end of your next turn.

Target player loses 3 life and you gain 3 life. (Then exile this card. You may cast the creature later from exile.)

Archive 5, archive 5, archive 5 (As this enters, shuffle the top five cards of your main library into a new face up library three times. Sacrifice this after the archived libraries are empty.)
At the beginning of your upkeep, exile the top card of each of your libraries. For each card exiled this way, you may play it without paying its mana cost.

{T}: Add {C}. Spend this mana only to cast a creature spell.
{T}, Sacrifice Waypoint Stone: Choose target creature card in your graveyard that was put there from the battlefield this turn. Return it to your hand.

Mimic {2} ({2}: This takes the shape of your choice. Mimic only as a sorcery.) [3/3]
[shape 1] Flying, double strike [3/3]
[shape 2] Hexproof
{T}: Put two +1/+1 counters on Forest Dragon Telo. [3/3]

Tap a creature you control: Prevent the next 2 damage that would be dealt by target creature this turn.
Tap a Reflection creature you control: Prevent all damage that would be dealt this turn by a source of your choice.

Enchant creature
Enchanted creature has flying and “{R}: This creature gets +1/+0 until end of turn.”