Theres a full FAQ which explains how to redeem the codes in detail, and here I provide a simple, brief version of it
You may play a land this way only during your own turn and only if you have not yet played a land this turn
He can use Dark Ruler No More to negate the effects of his opponents monsters, causing himself to suffer the drawback of not being able to inflict damage to his opponent for the rest of that turn
For example, you could use a site like MTG Proxy: And gift yourself a set of moxen
Etali, Primal Storm It requires some protection and building around, but if you manage to attack with Etali, Primal Storm, you can easily outvalue your opponents quickly
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