Attacking creatures get -2/-0 until end of turn.
Draw a card.

Put a +1/+1 counter on target creature, two +1/+1 counters on another target creature, and three +1/+1 counters on a third target creature.

Creature tokens you control get +1/+1 and have vigilance.

Return up to two target creatures to their owner's hand. You may search your library and/or graveyard for a card named Jace, Arcane Strategist, reveal it, and put it into your hand. If you search your library this way, shuffle it.

[+1]: Draw a card.
[+1]: Untap all creatures you control.
[−9]: Gain control of up to three target creatures.

Jorubai Murk Lurker gets +1/+1 as long as you control a Swamp.
: Target creature gains lifelink until end of turn. (Damage dealt by the creature also causes its controller to gain that much life.)

Target creature deals damage to itself equal to its power.

Gain control of target artifact, creature, or enchantment. Lands you control don't untap during your next untap step.

Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)
When Kheru Spellsnatcher is turned face up, counter target spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard. You may cast that card without paying its mana cost for as long as it remains exiled.

When Lamplighter of Selhoff enters the battlefield, if you control another Zombie, you may draw a card. If you do, discard a card.

[+2]: Put a -1/-1 counter on up to one target creature.
[−3]: Destroy target creature with a -1/-1 counter on it.
[−10]: Return all creature cards from your graveyard to the battlefield.

Other Merfolk you control get +1/+1.

Enchant creature
Enchanted creature has trample and haste.

Target player discards two cards.

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
Whenever you cast a noncreature spell, target creature gains flying until end of turn.

Exile all cards from all opponents' graveyards. You may cast spells from among those cards this turn, and you may spend mana as though it were mana of any type to cast those spells. At the beginning of the next end step, if any of those cards remain exiled, return them to their owners' graveyards.
Exile Mnemonic Betrayal.

Devoid (This card has no color.)
: Nettle Drone deals 1 damage to each opponent.
Whenever you cast a colorless spell, untap Nettle Drone.

[+1]: Untap target land you control. Until your next turn, it becomes a 5/5 Elemental creature with haste. It's still a land.
[−3]: Return target permanent card from your graveyard to your hand.
[−6]: You get an emblem with "Whenever a land enters the battlefield under your control, you may draw a card."

Flash
If an opponent would draw a card except the first one they draw in each of their draw steps, instead that player skips that draw and you draw a card.

Bestow (If you cast this card for its bestow cost, it's an Aura spell with enchant creature. It becomes a creature again if it's not attached to a creature.)
Enchanted creature gets +2/+3.