Whenever a creature enters the battlefield, Aether Flash deals 2 damage to it.

Return target creature to its owner's hand. Create X 1/1 green Saproling creature tokens, where X is that creature's converted mana cost.

Whenever a creature enters the battlefield under your control, you gain life equal to its toughness.

: Create a 1/1 green Insect creature token.

Anthroplasm enters the battlefield with two +1/+1 counters on it.
, : Remove all +1/+1 counters from Anthroplasm and put X +1/+1 counters on it.

, Sacrifice Armor Thrull: Put a +1/+2 counter on target creature.

Flying
Ascending Aven can block only creatures with flying.
Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

Haste
: Return Ashen Ghoul from your graveyard to the battlefield. Activate this ability only during your upkeep and only if three or more creature cards are above Ashen Ghoul.

Whenever a creature enters the battlefield under your control, you may destroy target artifact or enchantment.

, , Discard a card: Exile target attacking creature. Its controller gains life equal to its toughness.

Trample
Whenever a player casts a spell, put a chip counter on its converted mana cost.
B-I-N-G-O gets +9/+9 for each set of three numbers in a row with chip counters on them.

At the beginning of each player's upkeep, Barbed Wire deals 1 damage to that player.
: Prevent the next 1 damage that would be dealt by Barbed Wire this turn.

Defender
: Target creature gains haste until end of turn.

Creatures can't block.

Changeling (This card is every creature type.)
Up to two target creatures each get +2/+0 and gain all creature types until end of turn.

For each opponent, gain control of target permanent that player controls.

, Sacrifice Bloodfire Dwarf: It deals 1 damage to each creature without flying.

Flying (This creature can't be blocked except by creatures with flying or reach.)

Bog Rats can't be blocked by Walls.