When you activate a creatures ability, it goes on the stack, and at that point its independent of whether the creature stays on the battlefield or not
Attacking with 4-cost Karasu first and reducing the Power of the opponents Leader makes all your other Characters a greater threat when they attack, and it will force more Counter cards from opponents
Although not strictly a tutor, Lim-Dl's Vault lets you look through a good amount of your deck and then arrange your next five draws in the way thats most advantageous to you
These game mechanics arent just isolated to one colour, but the three colours of the designated clan

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Feasting Troll King I recently reread the article where Aaron Forsythe describes the banning of Skullclamp