While Meren can return that card to your hand, allowing it to be re-cast, if that card's mana value is less than or equal to the number of experience counters you have, it is put directly into play
Casting Cost: Card Text: Create a 0/1 black Wizard creature token with "Whenever you cast a noncreature spell, this token deals 1 damage to each opponent." Whenever your commander enters or attacks, you may pay
(2020-09-25) The player dealt combat damage mills cards only for the damage dealt by your Rogues, not for any other combat damage dealt to them at the same time
1 Starter Deck: 51 Cards
(Yes there are a few artifact creature lords but I never added any of them to this decklist as I felt that I didn't need them.) So with a mono blue deck you'd need to find other ways to buff up your zombies
Lightning, Army of One Lightning, Army of One paves the way for a ton of damage