Target creature gains double strike until end of turn. (It deals both first-strike and regular combat damage.)

Target creature gets +3/+3 until end of turn.

As an additional cost to cast this spell, sacrifice a creature or discard a card.
Destroy target creature or planeswalker.

Target creature gets -X/-X until end of turn.

Sacrifice this creature: Put a +1/+1 counter on target creature.

Enchant creature
When this Aura enters, draw a card.
Enchanted creature has ": This creature gets +1/+0 until end of turn."

When this enchantment enters, create a 1/1 green Squirrel creature token.
Whenever a nontoken creature you control dies, you may pay . If you do, return this enchantment to its owner's hand.

Target creature can't block this turn.
Draw a card.

Lightning Bolt deals 3 damage to any target.

Exile target creature. Its controller gains life equal to its power.

, Sacrifice a Goblin: This creature gets +2/+2 until end of turn.

Whenever this creature enters or attacks, you get .
Pay : this creature perpetually gets +1/+0. You may choose a creature card in your hand. If you do, that card perpetually gets +1/+0.

This creature can't attack alone.

Lifelink
Modular 1 (This creature enters with a +1/+1 counter on it. When it dies, you may put its +1/+1 counters on target artifact creature.)

Battalion — Whenever this creature and at least two other creatures attack, this creature gets +2/+2 until end of turn.

Until end of turn, target creature you control becomes a green Wurm with base power and toughness 6/4.
Overload (You may cast this spell for its overload cost. If you do, change "target" in its text to "each.")

Choose one —
• You gain 4 life.
• Destroy target enchantment.
• Put a +1/+1 counter on target creature.

Create a Treasure token. (It's an artifact with ", Sacrifice this token: Add one mana of any color.")
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Whenever you sacrifice an artifact or creature, put a +1/+1 counter on this creature.
, Sacrifice an artifact or creature: You gain 1 life and draw a card.

When this creature dies, create X tapped 1/1 green Squirrel creature tokens, where X is this creature's power.

Haste
When Reckless Ringleader enters the battlefield, choose a creature card in your hand. It perpetually gains haste.

Whenever another red creature you control enters, this creature gets +1/+0 until end of turn.

If one or more +1/+1 counters would be put on a creature you control, that many plus one +1/+1 counters are put on it instead.

, Sacrifice this creature: Creatures you control get +1/+1 until end of turn.

Look at the top three cards of your library, then put them back in any order. You may shuffle.
Draw a card.

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)
This creature can't block.

Reach
When this creature enters, seek an Elf card.

Flying
: Add one mana of any color.

Flying
When this creature enters, surveil 1. (Look at the top card of your library. You may put that card into your graveyard.)
Delirium — This creature gets +1/+0 as long as there are four or more card types among cards in your graveyard.

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
If a triggered ability of a Shaman or another Wizard you control triggers, that ability triggers an additional time.

, Exile this card from your graveyard: Create a 1/1 colorless Thopter artifact creature token with flying. Activate only as a sorcery.

When this Equipment enters, create a 1/1 colorless Thopter artifact creature token with flying, then attach this Equipment to it.
Equipped creature gets +1/+0.
Equip

, Pay 2 life: Choose one. Activate only once.
• This creature becomes a Human Cleric. It gets +1/+1 and gains lifelink.
• This creature becomes a Phyrexian. It gets +3/+2 and gains trample and "Whenever this creature is dealt damage, sacrifice that many permanents."

Whenever you discard a card, you may pay . If you do, amass Zombies 2. (Put two +1/+1 counters on an Army you control. It's also a Zombie. If you don't control an Army, create a 0/0 black Zombie Army creature token first.)

Lifelink
When Leonin Sanctifier enters the battlefield, choose a creature card in your hand. It perpetually gains lifelink.