Chronomantic Escape in hand or in exile with at least one time counter on it.
({4} magic symbol) ({W} magic symbol) ({W} magic symbol) the first turn if Chronomantic Escape is in your hand, or ({7} magic symbol) available otherwise, with ({7} magic symbol) available each following turn available.
Steps
If Chronomantic Escape is in your hand, cast it by paying ({4} magic symbol) ({W} magic symbol) ({W} magic symbol) .
Otherwise, activate The Tenth Doctor by paying ({7} magic symbol) , causing you to time travel three times, removing all time counters from Chronomantic Escape and cast Chronomantic Escape from exile without paying its mana cost.
Resolve Chronomantic Escape, preventing creatures from attacking you until your next turn, and exiling Chronomantic Espace with three time counters on it.