Although Tifa paired with Questing Druid and Mutagenic Growth makes already a decent competitive deck, that can be a cheaper option to start with for newcomers in the format
Mulldrifter is rather like Think Twice in that it is not wonderfully efficient card draw but offers enough flexibility to offset this
Apocalypse , the third set in the Invasion block, had an enemy-color theme (the first two sets were focused on ally-color pairs), so it redid a lot of the popular mechanical elements from Invasion and Planeshift , one of which was split cards
Then she has a hasted 1/5 body for just three mana with the ability to tap with three and then have her fight one of yours with another dork, and if you fight yours, it's just one mana to fight
Previously you had the choice between draft, set or collector boosters to collect your new cards