Serra Avatar's power and toughness are each equal to your life total.When Serra Avatar is put into a graveyard from anywhere, shuffle it into its owner's library.
FlyingLandfall — Whenever a land you control enters, create a 0/2 red Dragon Egg creature token with defender and "When this creature dies, create a 2/2 red Dragon creature token with flying and ': This creature gets +1/+0 until end of turn.'"
Mountain Valley enters tapped., Sacrifice Mountain Valley: Search your library for a Mountain or Forest card, put it onto the battlefield, then shuffle.
Haste, : Copy target activated or triggered ability you control from an artifact source. You may choose new targets for the copy. (Mana abilities can't be targeted.)
Exalted (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn.)Whenever a creature you control attacks alone, if it's the first combat phase of the turn, untap that creature. After this phase, there is an additional combat phase.
Hideaway 4 (When this land enters, look at the top four cards of your library, exile one face down, then put the rest on the bottom in a random order.)Mosswort Bridge enters tapped.: Add ., : You may play the exiled card without paying its mana cost if creatures you control have total power 10 or greater.