Masters sets always have some oddball color combinations that either lack a particularly coherent archetype (RG in MMA2013), have a low average ceiling (UR Elementals in MMA2015, BG Dredge in MMA2013) or are so flexible as to not really have have an archetype (WB in EMA)
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If Bruse Tarl and Ishai are your commanders, your deck may contain cards with red, white, and/or blue in their color identity, but not cards with green or black
[11] Key Colors: Red, White, and Black
Ive already mentioned ICRs as secondary perks for some other card-earning methods, but its a definite path on its own, too
Other Dalek and non-Dalek creatures may also block that creature and are free to block other creatures or not block at all