Second mode is great as it's basically a draw two at instant-speed

Abuna Acolyte Adorable Kitten Adorned Pouncer Ajani's Chosen Ajani's Pridemate Ajani's Sunstriker Ajani, Nacatl Pariah Alms Collector Angelic Cub Arahbo, the First Fang Arcbound Mouser Armored Skyhunter Balan, Wandering Knight Basri's Acolyte Blade of the Sixth Pride Bola Slinger Bounding Felidar Brimaz, King of Oreskos Brokers Initiate Charmed Stray Coeurl Cubwarden Dawnwing Marshal Eager Glyphmage Emeritus of Truce Enlightened Ascetic Envoy of Okinec Ahau Felidar Cub Felidar Guardian Felidar Savior Felidar Sovereign Forum Familiar G'raha Tia Gaelicat Garrison Cat Glittering Lion Glittering Lynx Gloryheath Lynx Gods' Hall Guardian Graceful Cat Guardian Lions Half-Kitten, Half- Healer of the Pride Helpful Hunter Herald of the Forgotten Hero of the Pride Highcliff Felidar Honorbound Page Huntmaster Liger Ingenious Leonin Ironpaw Aspirant Jamuraan Lion Jareth, Leonine Titan Jazal Goldmane Jedit's Dragoons Jhovall Queen Kemba's Legion Kemba's Skyguard Kemba, Kha Enduring Kemba, Kha Regent King of the Pride Kutzil's Flanker Leonin Abunas Leonin Arbiter Leonin Battlemage Leonin Den-Guard Leonin Elder Leonin Iconoclast Leonin Lightbringer Leonin Lightscribe Leonin Relic-Warder

Now you come to your first match
If it's a permanent spell, the copy gains haste and "At the beginning of the end step, sacrifice this permanent." (A copy of a permanent spell becomes a token.) Creature - Beast Demon Copy (CTRL to add secondary) Draw Artist's Talent (Gain the next level as a sorcery to add its ability.) Whenever you cast a noncreature spell, you may discard a card
The Bottom Line There is no single best card collecting app for everyone