Dyfed, Reborn by Altar

You may pay 5 life in addition to paying Dyfed's
mana cost. If you do, she gains haste, +2/+2, and
"Exile this creature at the beginning of your next
end step."
When Dyfed deals combat damage to a player,
exile cards from the top of your library until
you reveal a nonland card with converted mana
cost less than the amount of life that player lost
this turn. Until end of turn, you may play that
spell.