Forum:When can I activate Substitoad's effect?

Since it doesn't specifically say "during your turn" is it possible to activate Substitoad's effect during your opponent's turn? For instance, your opponent declares an attack on Substitoad. Can he tribute himself during the battle phase to bring out a Des Frog, for instance? Similarly, can you tribute tokens summoned to your field during your opponent's turn (such as Ojama Trio). And probably most importantly, can you summon Samara Lotus to your field during your end phase and then tribute it during your opponent's main phase? 69.116.155.192 10:05, 7 August 2008 (UTC)