Not only does this card offer a Lightning Helix on entry, but you can Escape it from your grave for a 6/6 creature that threatens to repetitively Lightning Helix every turn
Let's see what the rough ratios are for Feline Ferocity and how it compares: 52 mana: 37 lands plus Oreskos Explorer, Cultivate, Nissa's Pilgrimage, Sol Ring, Sword of the Animist, Hedron Archive, Herald's Horn, Dreamstone Hedron, Mirari's Wake, Zendikar Resurgent, Traverse the Outlands, Blighted Woodland, Krosan Verge, Myriad Landscape, and Hammer of Nazahn (I think it counts) -- I guess you can count Temple of the False God and Saltcrusted Steppe too but I'm not 10 "card advantage": Harmonize, Hunter's Prowess, Soul's Majesty, Skullclamp, Staff of Nin, Heirloom Blade, Kindred Summons, Zendikar Resurgent, Alms Collector, Herald's Horn (kinda) -- I don't count Hedron Archive or Dreamstone Hedron 10 targeted removal: Leonin Relic-Warder, Qasali Pridemage, Condemn, Crushing Vines, Wing Shards, Relic Crush, Argentum Armor, Stalking Leonin, Qasali Slingers, and kinda Grappling Hook 2 board wipes: Divine Reckoning and Rout 0 recursion 2 somewhat flexible tutors: Taj-Nar Swordsmith and Nazahn, Revered Bladesmith 0 graveyard hate 1 what I'd consider a surprise "I Win" card, Kindred Summons, and maybe a huge White Sun's Zenith, but otherwise nothing too surprising Obviously these ratios are a simplification and subject to opinion, but it's still a good way to quickly identify potential problems
Another unique power it possesses is sending another card an opponent controls back to the hand at the start of the battle
Delina grants players an opportunity to go really wide, creating creature tokens using the D20 die roll
It's not the most colorful card in the world, but the artwork itself is so impressive that it really doesn't need to be
I think we all know what would happen if those cards were unrestricted
