Alas, like many of us, owning that holo Charizard card was never part of my path in life, and the amount of money that one of these rare and expensive Pokemon cards sells for these days, means I will probably never have the funds to own one
Consider what they discard, what they create, and how well they help the rest of your deck do what it already does best
A 2/1 Human Wizard for two mana, Snapcaster Mage can be played at instant speed and gives an instant or sorcery in your graveyard flashback
For Boom, it requires you to target a land you control to be destroyed - however, indestructible lands can be targeted, so it sticks around while an opponent loses one of theirs
Thankfully, it does help that Jin Sakai is at least seriously powerful, but still, its hardly an ideal situation