As with many of the creatures, there are a ton of 1-mana effects, and they even come in every color: Wojek Siren, Aura Finesse, Horrifying Revelation, Taste of Blood, Bull Rush, Incite, Battlegrowth, and Sprout
It's just a shame that it happens to your lands as well
Per our Grixis Death Shadow example, for Cardhoarder you would set your card value limit to about $415, and for Manatraders you would choose either their Premium plan ($350 card value limit) or their Gold plan ($750 card value limit)
Trickster's Elk You want to say Trickster's Elk is like removal, and granted, switching off the busted activated abilities on a key creature is impactful in a singleton format, just make sure you don't care about your opponent controlling a non-flying 3/3 because you might accidentally improve an opposing creature with +1/+1 counters
Ruby/Sapphire Starter Deck List Improvements + Cards To Drop Most cards with Support or healing abilities on their own should go