Only if theyre already legal as part of a Standard-legal set if not, they arent
Hot Red Dragon Archfiend King Calamity lets you deal extra burn damage when it destroys a monster equal to the Attack stats of the monster that was destroyed
Since it can only be used once per turn, even if there are multiple situations where you use it as Synchro material, it is better to save it until you Synchro Summon "Junk Speeder." However, if you have "Junk Signal", which can stop effects activated in chain to a Synchro Monster, it is better to put the "Junk Speeder" effect at the end of the chain
Sure, your opponent might have ten beasts in their green deck, but Callous Oppressor would still be able to steal their four goblins, three elves, and two other creatures that weren't beasts
What is Bandai TCG+
Jewelry Bonneys leader ability lets you rest your opponents cards, slowing them down and giving you the opening to build power on your turn