If Woodcaller Automaton is no longer on the battlefield, use the power and toughness it had the last time it was on the battlefield
That said, the cards I loved the most from Yugioh were the big juicy 'pay life' cards, stuff like Mirror Wall could be devastating (better than Mirror Force if you have a reasonable board!), Solemn Judgement was insane, both were cards people in my meta hated because you paid life (they never noticed that Mirror Wall was a Trap card or something idk, I had played Magic before at least), these were among my favorite cards, at least I got my Judgement really easily, they thought it was a terrible card, I mean, half your life for a better Force of Will, who would play THAT poop tier card (I obviously would lol)
As part of the legendary Power Nine, this zero-mana artifact provides free red mana, giving aggressive decks an explosive edge right from the start
In Standard there won't be as many that are aggressively costed
Gold cards should (in the long run) hold and increase their value, especially those with Charizard printed on them, gold cards being hyper rare cards are some of the hardest to pull from Pokmon expansions