pokemon trading card game: destined rivals booster box Pokémon Elite Trainer Cards vary by pack. Pokemon TCG: Scarlet & Violet

it cannot attack until the end of your opponent's turn

At the start of the Damage Step, if the equipped monster attacks an opponent's Special Summoned monster: You can banish that opponent's monster

That damage is negated, and you gain Life Points equal to the amount you would have taken

So, for the first one, it just plops itself on the field in response to Chimera SSing, Golem's SSing, Orthros's destruction effect, or either Dragon's effect

Is the effect good enough to throw such a powerful monster away

It packs a ton of removal alongside a handful of counterspells to keep the opponent from doing anything too nasty