Show: All formats Goat Perfect Circle Edison
"Ectoplasmer" causes the turn player to Tribute during his/her End Phase, but the opponent does not Tribute. So while "Ectoplasmer" is out, I Tribute in my End Phase, and you Tribute in your End Phase. But I don't Tribute in yours and you don't Tribute in mine.
So 1 Tribute is performed during the End Phase of each player's turn. The Tribute is performed by the turn player. (Both players have to do this during their respective End Phases, not just the controller of "Ectoplasmer".)
Tributing a monster for "Ectoplasmer" is not a cost, it's an effect, so you can't Tribute monsters unaffected by Spell Cards.
If you have a face-up monster on your side of the field during the End Phase, you have to Tribute for "Ectoplasmer"'s effect.
If you have a face-up monster on your side of the field during the End Phase, you have to Tribute for the effect of "Ectoplasmer".
You can chain "Mystical Space Typhoon" or "Raigeki Break" to "Ectoplasmer"'s effect, and if there is no "Ectoplasmer" on the field, then its effect is not applied.
You can chain "Mystical Space Typhoon" or "Raigeki Break" to the effect of "Ectoplasmer", and if there is no "Ectoplasmer" on the field, then its effect is not applied.
You can activate "Soul Exchange" during your Main Phase and use its effect to Tribute your opponent's monster for "Ectoplasmer" during the End Phase.
If you Tribute your opponent's monster that you controlled with "Snatch Steal" or "Change of Heart", your opponent takes the damage even though it was their monster.