Blocking with these in play is a miserable experience as it often forces your opponents to chump forever
The only thing that you can safely trade for in bulk are commons/uncommons for decks (Yanma, Magnemite, Phanpy, etc), or average Trainer cards like Switch, Energy Retrieval, etc
This effect helped the user activate the final protection of the card, as any opposing monster that declared an attack would be destroyed , causing the adversary damage
Now, there aren't as many combat tricks on the blowout level of the uncounterable, unrespondable, +5/+5 and shroud variety these days
deck.): K type Character card with a cost of 3 or less other than [Scarlet] from your hand rested