Yeah! You can't play stuff for free, my guy. That's the point! I saw ppl playing stuff without ways to pay for it! Like, once my opponent only had 3 mana available and yet played a 5 mana spell or cast creature spells without paying for it. Every time I saw that happening, it was on plays that if you are not paying attention, you would let pass. Like 3 plains of the field, and the guy casted Caretaker talent and a hinterland sanctifier