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Now assuming we want pretty good odds (75% chance and above) to draw 3-5 Lands in our opening hand, and that everyone gets 1 free Mulligan, then the optimal number of Lands to have in your deck is 37

Relentless Rats

Basilica Guards Basilica Screecher Blind Obedience Crypt Ghast Kingpin's Pet Knight of Obligation Life Insurance Pontiff of Blight Sorin of House Markov Sorin, Ravenous Neonate Syndic of Tithes Syndicate Enforcer Syndicate Heavy The Kingpin of Crime Thrull Parasite Tithe Drinker Treasury Thrull Vizkopa Confessor

Its that easy

Otherwise, on our Time Walk turn, we drop our Tundra

A copy of a spell or ability is controlled by the player under whose control it was put on the stack