Alenni, Brood Recruiter Baru, Fist of Krosa Battle Frenzy Boartusk Liege Cabaretti Charm Catharsis Creakwood Liege Deranged Hermit Glistening Deluge Howlpack Alpha Imperious Perfect Juniper Order Advocate Jyoti, Moag Ancient Kaysa Kinbinding Meng Huo, Barbarian King Murkfiend Liege Nemata, Grove Guardian Nissa, Ascended Animist Paragon of Eternal Wilds Phabine, Boss's Confidant Plane-Merge Elf (playtest) Rank and File Restless Prairie Rouse the Swarm Selesnya Guildmage Silk, Web Weaver Squirrel Wrangler Sylvan Anthem Thelonite Hermit Tolsimir Wolfblood Verdeloth the Ancient Wall Crawl Wilt-Leaf Liege
You pay all costs and follow all normal timing rules for cards played from exile this way
If you have a way to intentionally ping your own creatures, Silverclad Ferocidons can clear out a lot of the board for you
Finally, starter decks come with a single booster pack of 12 random cards
It would be better as a B enchantment that just said "0: Discard a card from your hand." Speed is nice but in the cube things are a little more rounded
In my years of personal experience, examining good decklists, and talking to people much smarter than me, 50 mana sources is about the right number for most decks to shoot for, usually 37 lands and 13 ramp sources for a general budget deck