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That might seem like it is not worth it as haste is just speeding you up a turn and while the shroud is significant the main reason you want these is the haste
and Toski, Bearer of Secrets
This is supported by Ari Nieh, a designer and White's representative in the Council of Colors, who had this to say about Mangara: Mangara, the Diplomat signals the beginning of WOTC warming up to White getting some forms of good card draw, and I for one am extremely excited for it
For Gruul mana-fixing, I recommend prioritizing dual lands that count as both Forests and Mountains: Cinder Glade, Stomping Ground, Sheltered Thicket, and Taiga (if you're willing to spend lots of money) add layers of extra synergy to the deck because they can be fetched by lands (Wooded Foothills) and spells (Wood Elves) while also empowering cards that care about land types like Valakut, the Molten Pinnacle and Howl of the Night Pack
After that, it rolls, finding an instant or sorcery in our library or graveyard to put in our hand
