Hyperloop Obelisk enters tapped.
{T}: Add {U}, {B}, or {R}.
{VP}{VP}{VP}{VP}, Discard Hyperloop Obelisk: Untap target creature. It gets +4/+4 until end of turn.

Target creature has base power and toughness 1/1 and loses all abilities until your next turn.
Draw a card.

Favored
Whenever Iara, Blessed-Hart attacks, Iara and another target attacking creature gain double strike until end of turn.

{VP}{VP}{VP}: Reveal the top seven cards of your library. You may have Iconic Hologram become a copy of a legendary creature card revealed this way until end of turn. Put the revealed cards on the bottom of your library in a random order.

Trample
When Idealistic Voter enters, make a pledge.

{X}, {T}, Sacrifice another creature: Create a token that's a copy of target nontoken creature you control other than Identity Forger with mana value X.

Exile the top card of your library. You may play that card this turn.
Flashback {R}

Ignite deals damage to any target equal to your devotion to red.

Menace
Whenever Ignited Soul deals combat damage to a player, you may discard a card. If you do, draw a card.

When you cast this spell, target player skips their next combat phase.
[+1]: Create a 3/1 white Knight creature token with “As long as it's your turn, this creature has indestructible.”
[0]: Exile a permanent card from your graveyard. Return that card to the battlefield at the beginning of your next turn's end step.
[–3]: At the beginning of your next turn's end step, destroy all creatures.

Trample
When Imperfect Fugisaur enters, you may sacrifice an artifact. If you do, it gains haste until end of turn.
Whenever Imperfect Fugisaur deals combat damage to a player, that player sacrifices an artifact. If they can't, you draw a card.

Trample, haste
When Impetuous Knight enters, target opponent creates a Windmill artifact token with “{T}: Prevent all combat damage target Knight would deal to you this turn”.
Impetuous Knight attacks each combat if able as long as an opponent controls a Windmill.

Whenever Implacable Shrine-Guard attacks, for each color, do the following if your devotion to that color is three or greater.
{W} — Create a 1/1 white Human creature token.
{U} — Draw a card.
{B} — Each opponent loses 2 life.
{R} — Create a Treasure token.
{G} — You gain 3 life.

Create three 1/1 colorless Cyborg artifact creature tokens, then you gain 1 life for each artifact you control. Each opponent loses that much life.

Imposing Oddity enters with X +1/+1 counters on it.
Whenever Imposing Oddity becomes spellcharged, put a +1/+1 counter on it.
Spellcharge 4
When Imposing Oddity dies, you may put its counters on another target Ruin you control.

Ward {2}
Imposing Serpent enters with X +1/+1 counters on it.

Target creature gets +2/+2 until end of turn. If you've cast another instant or sorcery spell this turn, put a +1/+1 counter on it.

Target creature gets +2/+2 until end of turn. Untap that creature. Put a flying counter on it.

Draw a card, gain 3 life, then make a pledge.
If you've cast four or more spells named Incumbency this game and there are five colors among permanents you control, you win the game.

When Indentured Labourer enters, you draw a card and lose 1 life.

Vigilance
When Indomitable Jicru enters, you gain 5 life and draw a card. If it wandered, creatures you control get +2/+2 until end of turn.
Wander {6}{G}{W}

Target blocking creature you control dares 10.

Distribute two +1/+1 counters among one or two target creatures you control. Then if {G} was spent to cast this spell, put a lifelink counter on one of those creatures. Then if {U} was spent to cast this spell, put a vigilance counter on one of those creatures.

{3}{R}{R}, Exile Indulge the Fifth Encore from your hand: At the beginning of your next upkeep, you may cast Indulge the Fifth Encore from exile without paying its mana cost. Activate only as a sorcery.
Add {W}{U}{B}{R}{G}. Until end of turn, you don't lose this mana as steps and phases end.

Scry 1. Draw a card, then discard a card.
Flashback {U}