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Its probably pretty reasonable against Bant Snowpile, but Ice-Fang is a real issue there, so its hard to say

For many playtest cards, you'll need to make a generous assumption that basic game rules would be updated to allow them to work

Each trigger creates five artifacts in a 4-player game, which is conveniently enough to activate Time Sieve, and the rest is history

This wizard still isnt a slam dunk, but it only costs 4 mana, it creates a body as it enters, and it makes your board much more scary if you have other vehicles the turn it comes down

Outside of a few very specific cards (which will be mentioned first) that require deck sizes above the minimum, all the other reasons you might want to are more fitting to casual magic: Battle of Wits - A win condition that specifically requires you to have more than 3 times the minimum deck size left in your deck to win means starting with about 4 times that minimum, if not more