In muilticolour, there are: Two Dimir (blue/black) One Izzet (blue/red) One Simic (green/blue) One Bant (green/white/blue)
Getting a card that costs 0 includes lands, so we can transmute this land to find the more broken lands or combo cards like Zuran Orb and Mana Crypt
Many lifegain payoffs care about gaining 3-4 life in a single turn, so this white halfling can be part of a powerful value engine when you throw it together with the likes of Griffin Aerie and The Book of Exalted Deeds
They pop and bubble like, uh, well exactly like hot tar, but like, way more than usual
4 mana is a lot to pay for scry 1, then draw a card or play a land, but when you have nothing better to do with your mana, this card will pull you far ahead at a surprisingly quick pace
"That has protection from instants and sorceries." The good thing is that I'm not going to be facing down another Dragon when I already have to chump to stay alive