Forbidden Invocation

If all {u} was spent to cast this, draw 4 cards.
Take an extra turn after this one.
If all {r} was spent to cast this, Forbidden
Invocation deals 7 damage to all creatures your opponents control. After combat on your turn,
untap all creatures you control. Then,
there is another combat phase.
Flashback {10}{u/r}{u/r}{u/r}