So a buddy and I were playing a game of Magic that turned out to be a really quick game because he got King Macar, the Gold-Cursed out on the battlefield early. He was tapping it without attacking because of its obviously awesome ability but I don't know if you can tap a creature for its Inspired (untap-triggered) ability without attacking for it to then be tapped. Are you allowed to tap a creature whenever you want?
You can't just tap your creatures whenever you want. You can only tap it at one of the following times:
- When the game tells you to tap it (like when you attack).
- When a card tells you to tap it (like Twiddle).
- When you can tap it to pay a cost (like Endless Obedience).
Cards that would allow you to tap King Macar include spells with conspire and convoke, cards that grant tap abilities (that has a couple of false positives), and cards that tap creatures as an effect.