Tengu format ruling
Light Barrier
Card effect (current official text)During your Standby Phase, toss a coin. If the result is Tails, the following effects are negated until your next Standby Phase:
● When you Summon an "Arcana Force" monster, choose which effect to apply without tossing a coin. If an "Arcana Force" monster destroys an opponent's monster by battle, you gain Life Points equal to the destroyed monster's original ATK.
Rulings
- Light Barrier's effect to flip a coin during the Standby Phase starts a Chain.
- The effect of the Summoned Arcana Force monster still starts a Chain, but you do not toss the coin. When the effect resolves you will select if the heads or tails effect is applied.
- If an Arcana Force monster's effect is chosen in this way, it cannot be selected with Reversal of Fate or Arcana Call.
- Light Barrier's effect to gain Life Points starts a Chain when the opponent's monster is sent to the GY or Removed Zone at the end of the Damage Step.
- If your Arcana Force monster is also destroyed in the battle, Light Barrier's effect still activates.
- Only the controller of Light Barrier activates its effects.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Tengu forum — sourced change requests get reviewed.