Theyre colorless (like every land) and tap for one colorless mana
The card draw it offers unfortunately isnt the best by the standard of White can offer us now
Not only does this Weasel have menace, helping to get you to sneak damage in, but the unnamed Cruelclaw also has a powerful effect
This theme continues through to one of the other new mechanics, Emerge , which appears on giant Eldrazi creatures with colourless mana costsbut with the option to burst forth from your existing creatures for coloured mana, getting a discount in exchange for sacrificing one of your allies
Understanding this dynamic before you submit means you can prioritise your strongest candidates rather than sending cards with hidden surface defects that will quietly cost you a top grade
The first ability to pump another creature you control pairs perfectly with Elvish Mystic, but even if you dont have an ideal draw, you can always play another creature before you attack so that the counter has somewhere to go