Hello all !!

Card name : Ancient Forest
Type : Spell (Field)

Effect :

When you activate this card, change any Defense Position monster(s) to face-up Attack Position. Flip Effects are not activated at this time. If a monster attacks, destroy it at the end of that turn's Battle Phase.

Bug :

Gladiator beast monsters effect cannot activate their effetcs at the end of the battle phase in chain link 2 ( At the end of the Battle Phase, if this card attacked or was attacked: You can shuffle it into the Deck; Special Summon 1 "Gladiator Beast" monster from your Deck, except...)

I have also a question about the ruling of Tragoedia being affected to Shrink. What happens exactly ?
For Ancient Forest, during a duel, there's an option about auto chain building. Disabling that should fix the conflict between Forest and Gladiators. (Sorry if this isn't clear enough, I don't have access to the game at the moment >.< The options panel should be on the left, where the card descriptions are.)

Tragoedia has ? original ATK, which is treated as 0 for card effects while on the field. Shrink would halve that (half of 0 is still 0), then his effect would reapply and boost him by 600 for each card in your hand. So basically, Shrink does nothing to him.
But i can chain other cards at the same chain like forbidden lance waboku... I cant chain gladiator monster effect at this time you can check that if you want.

Ok thank you for tragoedia ruling