Arcum's Whistle [Ice Age] Aquapolis Whenever Kapsho Kitefins or another

Whenever Kapsho Kitefins or another creature enters the battlefield under your control

Set: Ikoria: Lair of Behemoths Type: Creature — Scorpion Rarity: Common Cost: {B} When Serrated Scorpion dies

Set: Ravnica: City of Guilds Type: Creature — Skeleton Rarity: Common Cost: {3}{B} Fear (This creature can't be blocked except by artifact creatures and/or black creatures

Set: Core Set 2021 Prerelease Promos Type: Creature — Cat Rarity: Rare Cost: {2}{G} Other Cats you control get +1/+1 and have protection from Dogs

Arcum's Whistle [Ice Age] Aquapolis Whenever Kapsho Kitefins or anotherSet: Ice Age Type: Artifact Rarity: Uncommon Cost: {3} {3}, {T}: Choose target non Wall creature the active player has controlled continuously since the beginning of the turn. That player may pay {X}, where X is that mana value. If they don't pay, the creature attacks this turn if able, and at the beginning of the next end step, destroy it if it didn't attack this turn. Activate only before attackers are declared.