When Hardlight Hedron enters, draw two cards, then discard a card.
{U}, {T}, Sacrifice Hardlight Hedron: Scry 2.

At the beginning of your upkeep, you may exile target multicolored card from your graveyard. You may cast a copy of it this turn.

At the beginning of your end step, if you control two or more other enchantments, create a 1/1 white Human creature token.

Target creature you control deals damage equal to its power to target creature. If this spell's flashback cost was paid, it deals that much damage to target player instead.
Flashback {4}{R}

Search your graveyard and/or library for a basic land card, reveal it, put it into your hand, then shuffle.
Surface {G}

When Harvesting Blade enters, target opponent exiles two cards from their hand.
Equipped creature gets +2/+1 and has “When this creature dies, you may cast a card exiled with Harvesting Blade with equal or lesser mana value without paying its mana cost.”
Equip {3}

Choose up to one for each color among blue, black, and red among permanents you control.
• Create two 2/2 colorless Minion creature tokens with decayed.
• You may sacrifice a creature. If you do, draw two cards.
• Until end of turn, creatures lose all abilities.

Hazakh District enters tapped unless you control an Island, a Swamp, and a Mountain.
{T}: Add {U}, {B}, or {R}.

Flash
When Hazard Blade enters, destroy target creature an opponent controls that was dealt damage this turn.
Equipped creature get +4/+0.
Equip {5}

Each player chooses up to one nontoken, nonland permanent they control. They lose life equal to its mana value. Destroy the rest.

When Heavy Snowfall enters, target creature you control gets +1/+1 and gains indestructible until end of turn.

When Heavy Winds enters and whenever you cast a spell, prevent all damage up to one target permanent would deal this turn.

As an additional cost to cast this spell, sacrifice a creature or pay {4}.
Heedless Cruelty deals 5 damage to target creature or planeswalker.

Enchant creature
Enchanted creature has defender.
Approval — {2}: Exile enchanted creature if its power is less than or equal to the number of colors among permanents you control.

Enchant creature
Enchanted creature gets +1/+1 and has protection from creatures.

{2}, Sacrifice Helm of the Shattered Realm: Destroy target artifact or enchantment. Activate only as a sorcery.
Equipped creature gets +1/+1 and has ward {2}.
Equip {1}

High Teqien enters tapped unless you control a basic non-Island land.
{T}: Add {U}.
{2}{U}, {T}, Sacrifice High Teqien: Gain control of target land. Its owner may search their library for a basic land card, put it onto the battlefield, then shuffle.

This spell costs {2} less to cast as long as you've cast another instant or sorcery spell this turn.
High Voltage deals 3 damage to any target.

You may pay {R} rather than pay this spell's mana cost. Spend only mana produced by artifact sources to cast it this way.
Hired Shot deals 3 damage to any target.

You draw two cards and you lose 2 life.
Landfall — If a land entered the battlefield under your control this turn, each opponent loses 2 life.

Flash
Enchant creature
Enchanted creature can't attack or block.

Holo-Map enters with two charge counters on it.
{1}, {T}, Remove a charge counter from Holo-Map: Target creature can't be blocked this turn. Scry 2.

Target player discards two cards. They lose 2 life if they discarded a land card this way.

Choose up to one target creature you control. You may discard a card. If you do, whenever that creature deals combat damage to a player this turn, draw a card.
Draw a card.

When Hostage Situation enters, target opponent reveals their hand. Exile a nonland card from it and up to one creature card from your graveyard. When Hostage Situation is no longer on the battlefield, return the exiled cards to their owner's hands.