Kaito, Bane of Nightmares not losing abilities.
My opponent had Kaito, Bane of Nightmares on their battlefield and it was their turn, so it was a creature. they attacked and then after combat activated one of its abilities. I responded by flashing in a Tishana's Tidebinder to counter that ability and make Kaito lose all of his abilities. At end of turn, Kaito went back to being a planeswalker with no abilities, but then on my opponent's next turn, even though it had no abilities, Kaito became a creature again.
Nick Fury 1127#38566
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Rezzahan#77802
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That is because Kaito's ability, like many other cards, change card types, and that happens in layer 4, before abilities are lost in layer 6. This is regardless of time stamp, since those only matter within a layer. Ability losing cannot stop a card type changing ability. More so, it cannot even stop additional effects of such an ability that happen in later layers, because rule 613.6b makes the effect apply fully, even if the ability generating it is lost.