If you want to just lock your table out of colored mana period, Ritual of Subdual is one of the ultimate griefer cards available in Commander
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But if you can get to seven mana and flip it (which is risky since you can only do it at sorcery speed and could get blown out by removal), the planeswalker version is insanely good
: Level 2 Whenever you attack, target attacking creature gets +1/+0 and gains trample until end of turn
The deck is very explosive, capable of running away with the game quickly, thanks to its low mana curve
By having the cards ready, you can immediately start testing new strategies and combos once the set is released