Incorrect rules interactions
I was playing MTG against a Green Red deck and I have a tax deck
I had Ghostly Prison on the battle battlefield. For each attacking creature pay 2 to attack.
He didn't pay the 2 he plays a Halana and Alena, Partners.
Some reason that card gave a different card hast and some +1/+1 counters and it allowed him to attack me with not just that creature but another one. He was tapped out of mana for casting the Halana. It makes no sense that the creatures could attack me even though he didn't pay the mana to attack me with those creatures
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Rezzahan#77802 commented
Did your opponent's creatures attack you, or rather a planeswalker under your control, or a Battle you defended? Because Ghostly Prison only taxes attacks against you, your planeswalkers and defended Battles are not taxed.
Also,giving haste and the +1/+1 counters are what Alana and Halena's beginning of combat trigger does.