During your Standby Phase, toss a coin. If the result is Tails, the effect of this card is 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.
When I put this card during Main Phase does it have the effect cuz the coin flipping is on next standby