japanese lost origins booster box VMAX Climax Pack Cards vary by pack. Pokemon TCG: Sword & Shield—Lost

Zhen-Yang attempted to attack with Phoenix but Shao-Jun flipped over Altergeist Protocol, allowing Multifaker to be Special Summoned

However, in regards to Pokemon TCG Live, TPCi announced: Backwards compatibility plans are ongoing, and phased support for additional Expanded format cards is expected to begin later this year

Both of them are unaffected by other monster's effects and have an additional effect that basically rewards their owner for using them in a dedicated "Paleozoic" Deck, by either destroying a troublesome card on the field or fetching a "Paleozoic" Card from the Deck

Life gain really isnt that powerful in a format where everyone starts with 40 life, and the difference between 3 and 4 mana is often huge, making this an excellent tradeoff (and a bit of consolation if you hit something of yours in the process)