The first method is pretty much what youd expect: open them in packs
Two mana to destroy an enchantment and get a few Saproling tokens at the same time is incredible
Nonetheless, this list looks at a few of the best and most popular kinds of duel winners

Advanced Search Sets Random Syntax Absorbing Man Adagia, Windswept Bastion Anikthea, Hand of Erebos Arboreal Alliance Arcane Bombardment Banish into Fable Cabaretti Confluence Calix, Guided by Fate Copy Artifact Copy Enchantment Copy Land Court of Vantress Crystalline Resonance Dance of Many Dual Nature Eiganjo Dynastorian Enduring Ideal Esper Terra Estrid's Invocation Eternal Dominion Eye of the Storm Felhide Spiritbinder Firebender Ascension Frontline Heroism Gleeful Sabotage Grist, the Plague Swarm Hatut Zeraze Strike Force Imperial Mask Kaya, Intangible Slayer Mine Excavation Mirage Mirror Mirrormade Molten Echoes Muster the Departed Myrkul, Lord of Bones Ondu Spiritdancer Plate Spinning Protean Thaumaturge Pyromancer Ascension Reflections of Littjara Renewed Solidarity Saruman of Many Colors Scion of Calamity Shapeshifter's Marrow Sundering Growth Tempest Technique Trystan's Command Weaver of Harmony Yenna, Redtooth Regent
Whats sure to be mobile gamings next big thing is here
Patrick would laugh at you and say that half your deck is always bad against half the field