Incorrect Interaction Programming - Station
Station does not allow for instant speed interaction.
Player 1 Casts Kona, Rescue Beastie - Creature Cast Resolves
Player 1 taps Kona to Station
Player 2 should be able to cast and instant speed spell here to remove Kona but Arena taps it immediately and only allows a response post station.
Station is Sorcery speed and as such, Instant cast should be able to interact with the creature between the creature spell resolving and the station ability being used.
This bug makes the deck that cheats out Turn 4 Omniscience unbeatable by everything except decks with a lot of direct counterspells.
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Rezzahan#77802
commented
There is no speed in Magic, only times when you are allowed to take actions and times when you are not. Sorcery timing is any time you have priority, in your main phase, when the stack is empty. Instant timing is any time you have priority. After any object on the stack finished resolving, the active player gets priority.
After resolving Kona, without any triggers going off from it entering, sorcery timing is achieved for your opponent. So they can activate station. Tapping a creature for station is a COST and so happens right away with the ability being put on the stack. The EFFECT of station is the permanent getting counters. There is NO WINDOW for you to cast an instant, since you only get priority after the opponent passes it to you. Same priciple applies to planeswalkers, hence why you usually cannot Lightning Bolt a planeswalker before it uses a loyalty ability.