Its flexible and the cost of a colorless land is bearable given its power
All these things are considerations for power level, the kill index is just a small slice of that
Additionally, Saskias strategy relies on consistent combat success, so evasion, trample, or ways to deal damage through blockers are key
You have a small collection at the moment, and wasting all your wildcards on a deck archetype you might not like is a one-way street to you being grumpy later on about your lack of available cards
Gaea's Cradle The best MTG land you can actually play An land only needs to produce two mana when you tap it to be, objectively, broken
Pair this with Mana Barbs, and your opponents will be taking 4 damage per mana they attempt to access