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Guildpact will give your nonlands all colors and then your lands all basic land types
Beyond that, any card that requires a target (i.e
Normally when we think of blue for Limited we think of card draw, some flying creatures, and maybe some bounce spells or counterspells of varying sorts
Probably best not to reanimate your own creature with this, though youre probably not planning around the 20 mode in the first place
Your mana pool is the sum of all lands played throughout a game and is slowly built upon over the course of a game - as you are only allowed to play one land card per turn