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Legality depends on the tournament format -- Bard Class can be legal in some formats and banned or restricted in others

As such, as a new Commander player, I would probably value the lands from Open Hostility more than the lands from Stalwart Unity, even though the Stalwart Unity lands have slightly more value

Any time you flicker a creature (flicker being MTG slang for spells and effects that temporarily exile a creature and then return it to the board, sometimes immediately), it re-enters the game as a brand-new object

It is going to be an uphill battle but with a little creative thinking, hopefully you can win the battle

In a word, no - weighing Pokmon packs is not a reliable way to increase your chances of getting better cards