Hold to the Flame enters the battlefield with a blaze counter on it.
Whenever you cast an instant or sorcery spell with mana value 4 or greater, put a blaze counter on Hold to the Flame. Then it deals damage equal to the number of blaze counters on it to any target.

Ward—Sacrifice a permanent.
Whenever Host of the Neverending Revel enters the battlefield or attacks, each player sacrifices a nonland, nontoken permanent. For each player who doesn't, you draw a card.

Hundred-Handed Pillars enters the battlefield tapped.
{T}: Add {W} or {U}.
{7}{W/U}: Hundred-Handed Pillars becomes a 4/6 white and blue Giant creature with vigilance until end of turn. It's still a land. This ability costs {X} less to activate, where X is your devotion to white and blue. Activate only once each turn.

Hyperloop Obelisk enters the battlefield 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.

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.

At the beginning of your upkeep, create two 1/1 white Soldier creature tokens.
Whenever a nontoken creature enters the battlefield under your control, sacrifice it and put a +1/+1 counter on each creature token you control.

Enchant land
Enchanted land is a 4/4 Dryad creature with reach, vigilance, and haste. It's still a land.
When enchanted land dies, return it to its owner's hand.

Choose artifact or enchantment. Return all noncreature cards of the chosen type from your graveyard to the battlefield.

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 the battlefield, 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.

Imposing Oddity enters the battlefield 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.

Whenever you cast a spell, exile up to one other target permanent you control. Return it to the battlefield under your control at the beginning of the next end step.

Vigilance
When Indomitable Jicru enters the battlefield, 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}

{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.

{3}, {T}: Choose a number between 1 and 4. Flip a coin. If you win the flip, Infernal Machine deals that much damage to any target. Otherwise, Infernal Machine deals that much damage to you.

Whenever Inner Ring's Pupil enters or attacks, target player discards a card. If they can't, they sacrifice a creature. If they can't, they lose 7 life.

As an additional cost to cast this spell, you may remove any number of loyalty counters from among planeswalkers you control. This spell costs {1} less to cast for each counter removed this way.
Create X 1/1 white Elemental Bird creature tokens with flying.

Whenever a creature you control attacks alone, it fights up to one target creature defending player controls.

Put a defender counter on each creature.

Target player sacrifices a creature. When they do, pay for and choose any number.
+{B} — Each player discards a card.
+{W} — Exile target player's graveyard. You gain 1 life for each nonland card exiled this way.
+{C} — Cast a copy of a card you don't own in exile with mana value 3 or less without paying its mana cost.

Choose one. If your devotion to red is three or greater, you may choose another. The same is true for devotion to white.
• Create four 1/1 white Human creature tokens.
• Creatures you control get +1/+1 and gain haste until end of turn.
• Opponents can't cast spells or activate abilities that aren't mana abilities this turn.

This spell can't be countered.
Destroy target nonland permanent.

Flying
Exile an instant or sorcery spell you control with mana value X: Choose one —
• You gain three times X life.
• Draw X cards, then discard a card.
• Put X +1/+1 counters on JJ Mack.

Haste
Whenever Jens Slopeskidder or a land enters the battlefield under your control, put a +1/+1 counter on target creature you control.
Wander—{1}{G}, Return a land you control to its owner's hand.