Sure, copying the right legendary creature just twice might be enough to win you the game, especially if were copying Kozilek But think of the possibilities
Its pretty much a deck that wants you casting creatures or token generating spells, then going all-in on combat
Since Titania only melds during the upkeep step, one of the first phases in a players turn, this means she cant meld until the turn after she comes into play at the earliest
You can: Tap two tokens to add one mana of any color
But unless your deck is already geared toward other strategies that also take advantage of these cards, trying to refill a spent Iceberg is gimmicky at best, and an inefficient use of mana at worst
It's understandable - MINT 9 might be the best grading we've ever seen this promo get