Ad Nauseam Archdemon of Unx Battlegrace Angel Brilliant Ultimatum Broodmate Dragon Caldera Hellion Clarion Ultimatum Covenant of Minds Cradle of Vitality Crucible of Fire Cruel Ultimatum Cunning Lethemancer Death Baron Ethersworn Canonist Feral Hydra Flameblast Dragon Gather Specimens Goblin Assault Hell's Thunder Immortal Coil Invincible Hymn Kederekt Leviathan Keeper of Progenitus Knight of the White Orchid Knight-Captain of Eos Manaplasm Master of Etherium Memory Erosion Mindlock Orb Minion Reflector Mycoloth Ooze Garden Predator Dragon Punish Ignorance Quietus Spike Ranger of Eos Realm Razer Sacellum Godspeaker Salvage Titan Scourglass Sedraxis Specter Sharding Sphinx Sigil of Distinction Skill Borrower Skullmulcher Spearbreaker Behemoth Stoic Angel Tar Fiend Titanic Ultimatum Vein Drinker Vicious Shadows Violent Ultimatum Where Ancients Tread

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Cards are only considered spells when they're on the stack
The wording of abilities also puts specific limits on when they can be used: if an activated ability has as a cost that says "discard this card", it can only be used when the card is in your hand, not when you have played the card and it is on the battlefield, or in the graveyard
Engle Standard Not Legal Alchemy Not Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp
but only at the cost of losing all his memories