The Kaldheim card isn't a counter spell, it's a polymorph for spells. Countering isn't in reds color pie, so this would need blue in its cost.
I think it's kind of like Planar Chaos, a very red and not at all blue-feeling card. I think maybe the reactivity of the instant version makes it seem less red. A card like Red Elemental Blast feels red when you counter a counterspell with it. What do you think about this one?
Uncertain Steps1R
Enchantment
Whenever a player casts a spell, flip a coin. If you win the flip, counter it and sacrifice Uncertain Steps.
We've got something less reliable than Lunar Force or Hesitation, but something that feels red to me.
I think Standstill could also be kitted with a coinflip and suddenly be red as well.
Tibalt's Trickery isn't at all like Planar Chaos. Planar Chaos is a very obvious break justified with "lol random". While Red Elemental Blast is part of the distant past where "my enemy can do this so I can do this to my enemy" was a valid justification for abilities being in the wrong color.
Exactly. There's a big difference between "Red uses countering as part of an effect to do something" to "Red gets counterspells now."