CCDD 020719 - Slivers of Tarkir

It looks like I may have inadvertently backed myself into a tribal theme this week. Oops. Anyway, here's the very beginnings of an idea I had last night. May I present, the Slivers of Tarkir:

We'll go in WUBRG order because WUBRG.

First up, Outlast was interesting, but it really needed a paired "creatures you control with a +1/+1 counter on them" ability for it to ever seem worthwhile. Because I wanted to keep these slivers as straighforward as I could get away with given my other constraints for this exercise, I had to leave the possibilities of... um... exploiting (?) outlast on Slivers to the imagination.

Prowess is a cool ability, but it shouldn't be evergreen, and if we're applying it broadly, it means a lot of triggers to track, especially in digital. Easier to do a single trigger across the board. I was considering doing some additional abilities beyond the basic prowess, but like with Outlast, I wanted to do the most basic version of these first.

I didn't have time to check on the templating here. Does it give the spells delve, or the sliver cards in your hand? Either way, might as well get some additional utility for those slivers whose abilities we're no longer taking advantage of.

I have no idea if this card is even possible to balance, but there's very little about the raid stock text that can care about slivers specifically. So all slivers get an ETB raid trigger. Damage for everybody!

Oh, ferocious. Ability word binary states really don't lend themselves to slivers, so I decided here to forego the keyword entirely and just make a Ferocious enabler. Here's the weakest link in a very very haphazard cycle. This is mostly a thought experiment, and it did inspire some very interesting ideas I may or may not follow up on soon.