Pack Rat's power and toughness are each equal to the number of Rats you control.
, Discard a card: Create a token that's a copy of this creature.

When this creature enters, choose one —
• Scry 2.
• You gain 3 life.
• Exile another target creature you own. Return it to the battlefield under your control at the beginning of the next end step.

Flying
Double strike (This creature deals both first-strike and regular combat damage.)
Lifelink (Damage dealt by this creature also causes you to gain that much life.)
Whenever you gain life, draw a card.

As long as there are four or more card types among cards exiled with this creature, it gets +4/+4 and has trample.
: Exile target card from a graveyard.

Whenever another colorless creature you control enters, you may change this creature's base power and toughness to that creature's power and toughness until end of turn.

Destroy each nonland permanent with mana value 2 or less. Add or for each permanent destroyed this way.

, : Add .

(: Add .)

Equipped creature has flying and lifelink.
Whenever equipped creature dies, you may pay X life, where X is its power. If you do, draw X cards.
Equip

When this creature enters, reveal the top four cards of your library. Put all Merfolk cards revealed this way into your hand and the rest on the bottom of your library in any order.
: This creature gains flying until end of turn.

Landfall — Whenever a land you control enters, investigate. (Create a Clue token. It's an artifact with ", Sacrifice this token: Draw a card.")
Whenever you sacrifice a Clue, put a +1/+1 counter on this creature.

Flash
Flying, vigilance
When Archangel Avacyn enters, creatures you control gain indestructible until end of turn.
When a non-Angel creature you control dies, transform Archangel Avacyn at the beginning of the next upkeep.

, Remove a counter from another permanent you control: Populate. Activate only as a sorcery. (Create a token that's a copy of a creature token you control.)
, Sacrifice another creature: Proliferate. Activate only as a sorcery. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Teamwork 5 (As an additional cost to cast this spell, you may tap any number of creatures you control with total power 5 or more.)
Reveal the top eight cards of your library. You may put a creature card from among them onto the battlefield. If this spell was cast using teamwork, put any number of creature cards from among them onto the battlefield instead. Put the rest into your graveyard.

Flash
Flying
When this creature enters, draw a card.
This creature has deathtouch as long as you control at least three other snow permanents.

As this enchantment enters, choose Mardu or Jeskai.
• Mardu — If a creature attacking causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time.
• Jeskai — At the beginning of your upkeep, create a 1/1 red Goblin creature token. It gains lifelink and haste until end of turn.

: Add .
: Add or . This land deals 1 damage to you.

Trample
Each other Vehicle and creature you control enters with an additional +1/+1 counter on it if its mana value is 4 or less. Otherwise, it enters with three additional +1/+1 counters on it.
Crew 3

Flying
When this creature enters, gain control of target creature for as long as this creature remains on the battlefield.

Flash
When this creature enters, empower Jace 3. (Put three loyalty counters on a Jace token you control. If you don't control one, first create a blue Jace planeswalker token with "[−1]: Surveil 1" and "[−3]: Draw a card.")
, Sacrifice this creature: The next spell you cast this turn can't be countered.