Hollow Dogs

Whenever this creature attacks, it gets +2/+0 until end of turn.

Howl from Beyond

Target creature gets +X/+0 until end of turn.

Draw four cards. You lose half your life, rounded up.

Enchant creature
Enchanted creature has swampwalk. (It can't be blocked as long as defending player controls a Swamp.)

{B}: This creature gets +1/+1 until end of turn.

Whenever an opponent discards a card, this enchantment deals 2 damage to that player.

All creatures get -1/-1 until end of turn.