You can take out any problem card stopping you going off, winning or just living regardless of its size or card type and you can do so for relatively little mana compared to the appropriate hard removal spell for that thing
Ruhan of the Fomori is perhaps the most straight-forward of these, rushing headlong into battle each turn, but never sure against whom
Almost every deck that can play it has well spent with this card
2 Surging Sparks is a Collector's Delight Chase Card / Price: Pikachu ex / ~$460 From a competitive player's view, "Surging Sparks" was not an amazing set because the only cards that have seen play at a tournament level are Hydreigon ex, Pikachu ex, Latias ex and Archaludon ex

"Lifetime" Pass Holder A Trail of Teacups Abduction Aberrant Mind Sorcerer Absolver Thrull Acolyte of Affliction Admiral Brass, Unsinkable Adwal, Breaker of Chains Agency Outfitter Ainok Wayfarer Airlift Chaplain Ajani's Aid Altar of the Wretched Amphin Mutineer Anathemancer Angel of Indemnity Angel of Sanctions Animate Dead Antique Collector Archfiend of Sorrows Archpriest of Shadows Arid Archway Ascendant Dustspeaker Ashiok's Forerunner Balustrade Spy Barrowin of Clan Undurr Bazaar of Wonders Bedlam Reveler Belfry Spirit Belonging Bitter Chill Bladewing's Thrall Blanchwood Prowler Blind Hunter Blood Fountain Blood Operative Blood Spatter Analysis Bloodwater Entity Body Snatcher Boneclad Necromancer Bonny Pall, Clearcutter Bookwurm Brass's Tunnel-Grinder Brazen Buccaneers Broodspinner Brotherhood Outcast Builder's Talent Callous Bloodmage Canoptek Scarab Swarm Canoptek Tomb Sentinel Capricious Hellraiser Carnage, Crimson Chaos Carrion Cruiser Carrion Imp Carrion Locust Cauldron Familiar Cavalier of Dawn Cavalier of Thorns Cemetery Desecrator Cemetery Gatekeeper Cemetery Protector Cemetery Tampering Cenote Scout Champion of Wits Chandra's Firemaw Charforger Charred Graverobber Chthonian Nightmare Clandestine Meddler Clattering Augur Clay-Fired Bricks Cleanup Crew

Before checking for lethal damage, the Seedling's controller would proliferate one time and could choose give the Seedling another +1/+1 counter