Unless your planeswalker is somehow a creature (like most Gideons, or something else with a Luxior, Giada's Gift equipped to it), you cant block with a planeswalker
Walking Ballista is the easiest payoff creature to disrupt, as the loop cannot proceed without first resolving Heliods activated ability or some similar lifelink-granting effect
Where are you stacking all your extra counters
Arcum's Astrolabe The common so powerful from Modern Horizons that it's been banned
Meanwhile, you can Shock a creature or a Planeswalker if you prefer, and you can exile it if it dies, removing any major shenanigans
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