If I have 2 Super Munchkin or Half Breed (or any equivalent) cards, am I able to use up to 4 races/classes (Or 2 races/classes without any race/class related penalties)? Effectively, do these bonuses stack, or can you only ever have 2 races and 2 classes?
You can only have two.
Super Munchkin says:
You may have two Class cards...
Half Breed says:
You may have two Race cards...
So that's exactly what you can do: have two. It doesn't matter how many of them you have. All they say you can do is have two. They don't say "one additional" or "twice as many".
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Too bad... I liked being a warrior, wizard, cleric, and thief all at once! Thanks though! – Timpanus Jan 12 '16 at 23:56
The Super Munchkin card only allows you to have two Class cards in play; ... however the Ultra Munchkin card from the Munchkin Rigged Demo and Munchkin 7 - Cheat With Both Hands sets states:
Official Rules
You may have three Class cards, and have all the advantages and disadvantages of each.
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1The Munchkin 7 expansion (either version) also includes the even better Super Duper Munchkin, which lets you use any number of Class cards. And, of course, 1/3-Breed and Chimera, which do the same thing for Race cards. – Ilmari Karonen Jan 14 '16 at 22:12