Put a hexproof counter on target creature you control. At the beginning of the next end step, remove a counter from that creature.

Hundred-Handed Pillars enters 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 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.

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.

Amity — This spell costs {1} less to cast if you attacked with exactly two creatures this turn.
Draw two cards.

Opponents can't cast more than one spell each turn.
[+1]: Create a 3/1 white Knight creature token with “As long as it's your turn, this creature has indestructible.”
[–X]: Return a permanent card with mana value X from your graveyard to the battlefield.
[–4]: If you controlled a creature as you activated this ability, you may destroy all creatures. You may do the same for artifacts and enchantments.

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.

This spell costs {1} less to cast if there is a card named Avert Disaster or Imminent Disaster in your graveyard.
Exile target creature or planeswalker.

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.

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.

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.

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.

Whenever you attack, double target attacking creature's power and toughness until end of turn.

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

Integrate target permanent spell.

When Inside Job enters, target creature can't be blocked this turn.
Whenever you amp it up, return Inside Job to its owner's hand.

Choose a card name. Target permanent gains protection from the chosen name until end of turn. Scry 2.

Choose target creature you control. Whenever that creature deals combat damage to a player this turn, draw that many cards. If {R} was spent to cast this spell, it gains trample until end of turn. If {W} was paid to cast this spell, it gets +1/+1 until end of turn.

Enchant creature
Whenever enchanted creature deals or is dealt damage, exile it.

Each player reveals their hand, then you choose a nonland card type. Each player discards all cards of the chosen type, then draws a card for each card they discarded this way.
Draw a card.

Enchant land
When International Development enters, make a pledge.
Enchanted land has “{T}: Add two mana of different colors.”

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.