Starter [Beginner-Friendly, Flying Creatures, Easy to Learn Card Draw] If youre new to Magic or just want an easy deck to jump into Commander, First Flight is a great place to start
Trading your worst creature in a format where 90% of your creatures were bad for your opponent's best creature when they might have 2-3 good creatures to win with cannot be undervalued
Rograkh easily represents six cards for two mana with Tevesh but also provides free sacrifice fodder for the spells that let you generate a burst of mana or draw a bunch of cards
Since Blue is all about control, that is, keeping your opponent from doing what they want rather than attacking directly, card draw is vital for a Blue player
In a low-to-the ground format like Modern, Fatal Push can take down almost any creature on the battlefield with the consistent revolt triggers due to the Fetchland mana base
If you have effects that preserve counters after death, this can lead to increasing the number of counters when Zack dies , making his death both fun and profitable