msem-instigator

Whenever you cast a spell, you may cast a spell from your hand with lesser mana value without paying its mana cost.
You can't cast more than one spell of each card type each turn.

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
When Idleglen Instructor enters, draw a card, then discard a card.

When Iekin's Portal enters, look at the top five cards of your library. Put one into your hand and the rest into your graveyard.
{1}{U}{U}: Transform Iekin's Portal. Activate only if your fealty to Islands is five or greater.

Indestructible
You have no maximum hand size.
Whenever an opponent draws a card, you draw a card.
If you would lose the game other than for having 0 or less life, you win the game instead. (Another player winning the game does not cause you to lose the game.)

Flying
When Illusionary Steed becomes the target of a spell or ability, sacrifice it.

Flash
Whenever you make first contact, you may put a card you own from outside the game into your hand. (You make first contact the first time each turn you cast a spell with a name not in your graveyard or control already.)

Shuffle any number of cards from your graveyard into your library.
Scry 1, then draw a card.

Imitator of Drakes has flying as long as it has a +1/+1 counter on it.
{2}{U}: Put a +1/+1 counter on Imitator of Drakes.

You may have Imitator of Success enter as a copy of any creature on the battlefield, except it has no mana cost and base power and toughness 1/1 if it's a token.
Successor {1}{U}{U} ({1}{U}{U}, Exile this card from your graveyard: Create a token that's a copy of this card, except it has no mana cost and base power and toughness 1/1. Succeed only as a sorcery.)

Tap target creature. It doesn't untap during its controllers next untap step.
Judge target creature you control. (Honor it by putting a +1/+1 counter on it or condemn it by sacrificing it to draw a card.)

Draw three cards.
Lifecycle {3} ({3}, Discard this card: Create two tapped 1/1 colorless Elemental creature tokens.)

Draw a card.
Civilized — Instead draw two cards if you control an artifact, a creature, and an enchantment.

When Imperial Artisan enters, draw three cards, then put two cards from your hand on top of your library in any order.

When Imperial Diplomats enters, if it's not a token, create a token that's a copy of it, except it has no mana cost.
{T}, Tap an untapped creature you control: Draw a card, then discard a card.

Mill four cards, then return a noncreature card from your graveyard to your hand.

Draw a card. Create a Treasure token. (It's an artifact with “{T}, Sacrifice this artifact: Add one mana of any color.”)

Enchant land you don't control
Whenever enchanted land becomes tapped, you may draw a card.

{U}, Sacrifice Imperious Nixie: Return target creature to its owner's hand.

Flash
Defender
When Imposing Barricade enters, target creature doesn't untap during its controller's untap step for as long as you control Imposing Barricade.

Look at target player's hand. You may choose a nonland card from it. If you do, that player reveals that card, puts it on the bottom of their library, then draws a card.

As long as Inconspicuous Platypus is enchanted or equipped, he's a 3/3 legendary Platypus Rogue named Agent P and can't be blocked.

When Infamous Bilgecaptain enters, forebode. (Create a tapped colorless Omen artifact token with “{T}, Discard a card, Sacrifice this artifact: Draw a card.)
Other Pirates you control get +1/+1.
At the beginning of your end step, you may put a Pirate card with mana value less than or equal to the number of artifacts you control from your hand onto the battlefield.

Whenever you cast an artifact spell, scry 2.

Enchant creature (Target a creature as you cast this. This card enters attached to that creature.)
Enchanted creature can't be blocked.
{1}{U}: Enchanted creature gains hexproof until end of turn.

At the beginning of your end step, shuffle your hand and graveyard into your library, then draw seven cards.