Flying: Search your library for a Dragon permanent card and put it into your graveyard. If you do, Scion of the Ur-Dragon becomes a copy of that card until end of turn. Then shuffle.
Split second (As long as this spell is on the stack, players can't cast spells or activate abilities that aren't mana abilities.)You can't lose the game this turn and your opponents can't win the game this turn. Until end of turn, damage that would reduce your life total to less than 1 reduces it to 1 instead.
Buyback (You may pay an additional as you cast this spell. If you do, put this card into your hand as it resolves.)Create an X/X green Wurm creature token.
: Add .When Flagstones of Trokair is put into a graveyard from the battlefield, you may search your library for a Plains card, put it onto the battlefield tapped, then shuffle.
Split second (As long as this spell is on the stack, players can't cast spells or activate abilities that aren't mana abilities.)Target creature gets +5/+5 and gains shroud until end of turn. (It can't be the target of spells or abilities.)
Suspend 3—Each player exiles all creature cards from their graveyard, then sacrifices all creatures they control, then puts all cards they exiled this way onto the battlefield.