Mournwhelk

+1: You gain 2 life. −1: Put a +1/+1 counter on each creature you control. Those creatures gain vigilance until end of turn. −6: Create a white Avatar creature token. It has "This token's power and toughness are each equal to your life total."

Vigilance When this creature enters, each player's life total becomes the highest life total among all players.

Choose two — • Destroy all artifacts. • Destroy all enchantments. • Destroy all creatures with mana value 3 or less. • Destroy all creatures with mana value 4 or greater.

Changeling (This card is every creature type.) Flying

Enchant creature Enchanted creature has double strike. (It deals both first-strike and regular combat damage.)

First strike T: Brigid deals 2 damage to each attacking or blocking creature target player controls.

Protection from red Sacrifice this creature: Prevent all damage a red source of your choice would deal this turn.

Whenever this creature attacks, it gets +1/+1 until end of turn for each other attacking Kithkin.