pokemon swsh promo card list Rapidash - SWSH270 Pokemon Promo Holo Rare Coalossal

Theres more than enough good control when you have access to all five colors Niv-Mizzet Reborn can attest to that

So what other colors to add

The best cards left are Chandras Embercat, Unsummon, Griffin Protector, and Mammoth Spider

The table below outlines each specialized treatment (announced so far) and which Magic: The Gathering product it can be found in, along with the listed MSRP price for each product as denoted by WOTC

Cheaper alternatives like Confidant or those that provide utility like Arguel's Blood Fast are the way to go usually

This gives access to all four color combinations except for Witch-Maw (Green White Blue Black)