This spell costs less to cast if it targets a tapped creature.
Destroy target creature.

Lifelink (Damage dealt by this creature also causes you to gain that much life.)

At the beginning of combat on your turn, target creature you control gets +1/+0 and gains first strike until end of turn.

Vigilance
: Put a +1/+1 counter on each other Hero you control.

You may sacrifice an artifact or discard a card. If you do, draw two cards.

Return up to one target permanent card from your graveyard to your hand.
Create a Clue token. (It's an artifact with ", Sacrifice this token: Draw a card.")

Prowler can't be blocked by creatures with power 2 or less.
Whenever Prowler deals combat damage to a player, put a +1/+1 counter on another target creature you control.

Changeling (This card is every creature type.)
Exile target creature. Its controller creates a 1/1 colorless Shapeshifter creature token with changeling.

This spell costs less to cast if a creature card was put into your graveyard from anywhere this turn.
Return up to two target creature cards from your graveyard to your hand.

When this creature enters, investigate. (Create a Clue token. It's an artifact with ", Sacrifice this token: Draw a card.")
Whenever you draw your second card each turn, this creature gets +1/+1 and gains vigilance until end of turn.

: Scry 1. (Look at the top card of your library. You may put that card on the bottom.)

When this artifact enters, it deals 4 damage to any target and 3 damage to you.
, , Sacrifice this artifact: You gain 3 life.

Create a 3/3 blue and red Elemental creature token with flying.
Surveil 2. (Look at the top two cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)

Reach
When this creature enters, distribute three +1/+1 counters among one, two, or three target creatures, then you gain life equal to the greatest toughness among creatures you control.

Flying, vigilance
Alliance — Whenever another creature you control enters, this creature gets +1/+0 until end of turn.

Look at the top six cards of your library. You may reveal a creature card from among them. If that card has mana value 2 or less, you may put it onto the battlefield and it gains haste until end of turn. If you didn't put the revealed card onto the battlefield this way, put it into your hand. Put the rest on the bottom of your library in a random order.

Vigilance
: Put a +1/+1 counter on each other Hero you control.

Whenever one or more creature cards are put into your graveyard from anywhere, you draw a card, lose 1 life, and put a plan counter on this enchantment.
When the third plan counter is put on this enchantment, sacrifice it and create three 2/2 colorless Robot Villain artifact creature tokens.

When this creature enters, you may exile a creature card from your graveyard. When you do, return target instant or sorcery card from your graveyard to your hand.

Return up to one target nonland permanent to its owner's hand. Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.