Typically, the newer cards dont tend to be worth much, since they are easily found on the market, making it simple for collectors to find cards to complete their set
If, during your declare attackers step, Ursine Monstrosity is tapped, is affected by a spell or ability that says it can't attack, or hasn't been under your control continuously since your turn began (and doesn't have haste), then it doesn't attack

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Greninja ( Genetic Apex ) and Jolteon ex ( Mega Rising ) can both damage the opponent's Bench with their ability: Greninja has the Ability Water Shuriken, where once during the player's turn they can deal 20 damage to one of the opponent's Pokmon, including Benched Pokmon, and Jolteon ex has Electromagnetic Wall, which deals 20 damage to an opposing Pokmon - including Benched Pokmon - when the opponent attaches Energy from the Energy Zone to that Pokmon
That means that Tamiyos Safekeeping is pretty much right up your alley