Inquisition of Kozilek Bug
During a match, I used Inquisition of Kozilek on an opponent with the split card Repudiate/Replicate. I couldn't target it with Inquisition when it is a viable target as both parts of the card cost 3 or less.
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Rezzahan#77802 commented
A split card anywhere but on the stack has the mana value of both halves combined.
709.4. In every zone except the stack, the characteristics of a split card are those of its two halves
combined. This is a change from previous rules.709.4b The mana cost of a split card is the combined mana costs of its two halves. A split card’s
colors and mana value are determined from its combined mana cost. An effect that refers
specifically to the symbols in a split card’s mana cost sees the separate symbols rather than the
whole mana cost.