With Glarb, cards that allow you to play more than one land a turn are very good, as are flashback spells or reanimation
This is easily the most opened, high-velocity box on the market today
Players will find homes for him, but I suspect this will be more of an $8-$10 card based on how narrow it is
It's useless in the wrong deck, but if you can manipulate your top card, it's a super efficient means of drawing cards
Part of numerous infinite combos, the X spell, Ballista can play board control of player control, depending on your mana situation
For example, if you attack one player with Tifa and another player with five creatures, Tifa will get +2/+2 until end of turn