I went with Treasure Cruise, even though Dig Through Time is better for combo decks
If you control no monsters, or all monsters you control are Machine monsters you can activate these effects: You can Special Summon this card from your hand, then you can reveal 1 Machine monster in your hand, and if you do, Special Summon the revealed Machine monster from your hand, also its Level becomes 9, until the end of this turn
With the set so focused on vehicles, I found myself at times struggling to get sufficient creatures to crew them
Similarly, both Inspiring Statuary and Jaheira, Friend of the Forest will let you tap your existing Treasures for mana to make new ones without losing the older ones
Part of that scarcity is due to it being a Japan-exclusive card, one released before the series became the massive hit it is today