Just to clarify for anyone coming here confused; in the rules reference it states that the word "then" requires the previous sentence to resolve in order for its sentence to resolve. So if there is no Sentinel in play after the Surge, you don't have to deal with the 5 damage.
조우
배반
Magnetic.
Surge.
When Revealed: Defeat a Sentinel minion in play. Then, take 5 damage. You may discard X cards from your hand to prevent X of that damage.
Boost:
"I should have seen that coming!" —Cyclops
Mutant Genesis #155. Magneto #26-27.

- Magnetic Missile Magneto #10
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