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Don't sleep on Leafcrown and the ability to make a huge stop sign for fliers

Spend this mana only to cast a legendary spell, and that spell can't be countered

But even something like the Initiative or co-operative/politicking mechanics like Pendant of Prosperity or Join Forces frequently creates this intrusive feeling, simply due to how their resource incentives interact with the prisoners dilemma of free-for-all multiplayer

Imagine bolting your opponent's bird, only for them to exile said Birds of Paradise with Agatha's Soul Cauldron, giving all of their creatures with +1/+1 counters the ability to produce mana