In general, a monster's effect can only be used while it is face-up on the field. If it can activate in a different zone, such as hand (Gorz, Emissary of Darkness) graveyard (Necro Gardna) or while banished (Stardust Dragon) then it will say so on the card. This is why a card such as Cyber Dragon cannot freely summon itself from the graveyard every time the condition is correct - it summons from hand.
Evil HERO Infernal Gainer has no such text, therefore the cost of banishing it to activate its effect, can only be performed while it is face-up on the field.
Chat with our AI personalities
Odin says that if he is destroyed, you may resummon him by removing a Tuner from your graveyard, during that turn's End Phase, ie, the turn in which he was destroyed. If you have no Tuners that turn, then you can't activate this effect, and if you pass that turn's End Phase, then you have passed the time to activate it, so it does not matter to Odin if you get a Tuner in your graveyard after that.
No. It is an Ignition Effect, meaning you may only activate Snipe Hunter's effect during your turn.
Yes they do, as they activate their effect when they are destroyed and sent to the graveyard.
Yes, generally you canBUT there are some cards that doesn't allow the effect to activate if you attack. Example is Chaos Sorcerer.so make sure to read the card text first.
Sangan triggers in the graveyard, so it's irrelevant if it was face down or face up when it was destroyed. It will trigger in both cases.