Basically, when you special summon a monster with 1500 or less ATK with cards like marauding captain, call of the haunted, or monster reborn, you can activate this card when your opponent has a face-up monster to special summon all copies of that monster. Your opponent can special summon all copies of his monster too, but that's a rare chance IMO.
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A Fusion Summon, or the Summoning of any Monster (Synchro or Fusion) from the Fusion Deck (Extra Deck) is a special summon and so Trap Hole will not work on it.
Yes it will work also it can work with special and tribute summons as well it will also work if the oppenent plays a monster on his-her side of the field
Seeing how they are supposed to work hand in hand as a great combination, but seeing how the question is to see which is better, it is Red-Eyes Darkness Metal Dragon, not because of ATK and DEF, but because of how easy it is to Summon him, along with an effect to Summon more powerful Dragons as well. You can Summon Poki Draco and Banish it to Summon REDMD in an instant. While Prime Material has to be either Special Summoned by another method, or plain Tribute Summon it, which is usually slower.
Yes... you can Special Summon Exodia the Forbidden One by discarding him and using Monster Reborn, but you will not automatically win the duel. Exodia's effect will only work when it and the other four pieces of Exodia are in your hand.
Normal summon, no. Special summon, yes.The reason is, when Obelisk is normal summoned, no spells, traps or monster effects can be activated. That means it prevents anything being activated in the 'summon response' window, which is where you'd normally use cards like Trap Hole, Bottomless Trap Hole, Torrential Tribute, etc.