It's not impossible it won't be back, but it would take some effort
Cavern-Hoard Dragon Unlike the previous three cards, which just cost a few cents, this dragon comes with a hefty price tag but if you expect your opponents to have a handful of artifacts (like a bunch of mana rocks), Cavern-Hoard Dragon is a huge monster that can hit the board early and give you a massive mana boost
Remember that just a second is a variant of the mechanic split second
Also, until the swap happens, the ninjutsu card is technically in your hand
People can sign Autograph Book more than once, but it's one page counter per person, not per autograph, so they're just taking up space where other people could be signing
Old-time MTG players know it well, as it was part of the deck that won the 1998 World Championship, piloted by Brian Selden