Cast Last Chance by paying ({R} magic symbol) ({R} magic symbol) , causing you to take an extra turn after this one.
Activate Magar by paying ({1} magic symbol) ({B} magic symbol) ({R} magic symbol) , noting Last Chance and putting it face down as a 3/3 creature.
Activate Magar by paying ({1} magic symbol) ({B} magic symbol) ({R} magic symbol) , noting Stunning Reversal and putting it face down as a 3/3 creature.
Move to your next turn.
Deal combat damage to an opponent with both face down creatures, triggering their abilities.
Resolve the first trigger, causing you to cast a copy of Last Chance without paying its mana cost.
Resolve the copy of Last Chance, causing you to take an extra turn after this one.
Resolve the second trigger, causing you to cast a copy of Stunning Reversal without paying its mana cost.
Resolve the copy of Stunning Reversal.
At the beginning of your end step, Last Chance triggers, causing your life total to become one and you to draw seven cards due to Stunning Reversal.