Why do people not run ancient forest in a Gladiator Beast Deck?

It seems like a good card to run, but no one runs it in competitions. Why is this so?|||Because they don't need it, and it also doesn't really help at all. You don't want to lose any Gladiator Beast to anything, including battle. Ancient Forest doesn't stop the attack, so your Glad Beast still dies. Sure, afterward, their monster dies too, but you've still lost a Glad, which is probably more important to you than your opponent's monster was to them. Dimensional Prison is a much better option, even though it only stops one attack, it keeps your Gladiator Beast safe, which is what's really important.|||That's actually a pretty good idea.





Ancient Forest would activate, then the glad beast would chain it. Then, the glad goes first and special summon other glad, and ancient forest would have no target.|||Think of it this way, the card alone is basically a double edge sword. When the card is in play monsters can not be in defence mode and they can't really attack unless they are willing to loose a monster after battle. Think of it as a long term version of After Genocide. However there are tips on using this card effectively. Take a look at the link below.|||Makes the deck too slow, there are much better cards to run