pokemon card frame Magnet by Viledisgorgement Framing Japanese Pokémon Cards: A

A few cards have the text Remove [this card] from your deck before playing if youre not playing for ante. These are the only cards that can add or remove cards from the ante zone or change a cards owner

The value of X is calculated only once, as the reflexive triggered ability resolves

P/T Number 166 Language English Legal Formats Commander, Legacy, Modern, Vintage Not Legal Formats Alchemy, Brawl, Competitive Brawl, Historic, Pauper, Pioneer, Standard, Timeless Rulings (3/19/2021) The ability that defines Tarmogoyf's power and toughness works in all zones, not just the battlefield

its a big beastie, yes, but beyond that its pretty much a blank canvas

For example, control decks have no problem digging through their decks, so having one-offs won't affect them as they will be able to get to their sideboard cards easily (and this is a big reason why control decks are often so good)