In Mark Rosewaters recent Blogatog posts, he makes it clear that he, and Magic R&D at large, prefer using first main phase triggers to upkeep triggers
This is important for death triggers, like on Clone Shell, as dying has a very specific meaning in Magic
Both 17 Combee Grass 50 Call for Family Put 1 random basic Pokmon from your deck onto your bench
To make it worse, let me quote from Wizards website: Karn Liberated is 2025s Pro Tour and World Championship Secret Lair prize card, so expect to see more of our favorite sun-tanning silver golem throughout the year at the Magic Pro Tour. Right now, on eBay, I can find nonfoils under $300 and foils for $1200
Kaalia benefits from being aggressive, so summoning sickness is her enemy