Split second (As long as this spell is on the stack, players can't cast spells or activate abilities that aren't mana abilities.)
Return target permanent to its owner's hand.

As an additional cost to cast this spell, discard a card.
Draw two cards and create two Treasure tokens. (They're artifacts with ", Sacrifice this token: Add one mana of any color.")

: Untap target creature.

First strike
: Destroy target artifact if its mana value is equal to the amount of unspent mana you have.

: Add .
, : Exile target creature you control.
, , Sacrifice this land: Return each creature card exiled with this land to the battlefield under its owner's control.

Creature spells you cast cost less to cast.
Whenever another creature you control enters, this creature deals 2 damage to it. If a Dinosaur is dealt damage this way, this creature gets +2/+0 until end of turn.

Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)
: Add .

Whenever this creature or another creature dies, target player loses 1 life and you gain 1 life.

(: Add .)

+1: Add . Spend this mana only to cast instant or sorcery spells.
+1: Discard up to three cards, then draw that many cards.
−8: You get an emblem with "You may cast instant and sorcery spells from your graveyard. If a spell cast this way would be put into your graveyard, exile it instead."

Menace
Whenever one or more creatures you control deal combat damage to a player, create a Food token.
Whenever you sacrifice a Food, put a +1/+1 counter on this creature.
When this creature leaves the battlefield, target opponent loses life equal to its power.

This creature can't be blocked.
When this creature enters, target opponent creates five 1/1 red Goblin creature tokens.

Whenever this creature blocks or becomes blocked by a green or white creature, destroy that creature at end of combat.

Creatures entering don't cause abilities to trigger.

Destroy all creatures. They can't be regenerated.

Demonstrate (When you cast this spell, you may copy it. If you do, choose an opponent to also copy it.)
Shuffle your library, then reveal cards from the top of it until you reveal a nonland card. Exile that card and put the rest on the bottom of your library in a random order. You may cast the exiled card without paying its mana cost.

Enchant creature
Whenever enchanted creature is dealt damage, its controller creates that many 1/1 green Squirrel creature tokens.

Target opponent reveals their hand. You may copy an instant or sorcery card in it. If you do, you may cast the copy without paying its mana cost.

Flying
Creatures can't attack you unless their controller pays for each creature they control that's attacking you.

( can be paid with either or 2 life.)
Target creature gets -5/-5 until end of turn.