Temporal Mastery Temporal Mastery is okay-to-good as a time walk effect that costs 7 mana
In a table with 4 decks, two with PL 5 and two with PL 6, they could compete, although the PL 6 has a small advantage
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Remember, your hand is going to consist of seven cards at the start of the game, and if your plan is to spend one of those ramping to get to a four-mana turn three, then you really want to be spending all that mana every turn to get the most value out of that card
We also brought penny sleeves (think sleeves made of transparent plastic), to protect the cards, because nobody likes to find out that their precious cards got damaged when staging in a pocket or backpack sleeve
It is possible to get showcase versions of rares and mythic rares in these slots