Asphyx, Lost To Time

Lifelink, Vigilance, Shroud
Whenever Asphyx deals combat damage to a
player, exile Asphyx at the beginning of the next
end step, take an extra turn after this one. Return Asphyx to the battlefield at the beginning of
your next turn's end step.
{g}{w}{u}{b},{t}: The next Dragon, Elf, Beast, or
Noble spell you cast gains Split Second until end
of turn