mtg most valuable cards by set Rarest Magic: The Gathering & Their Prices Slideshow: The 10 Most Valuable

This means you get the full effect if you get it early

More destruction, more salt and bitters

For free

Red Blue spell commander Creature (13) 1x Arjun, the Shifting Flame 1x Charmbreaker Devils 1x Etherium-Horn Sorcerer 1x Goblin Electromancer 1x Guttersnipe 1x Hypersonic Dragon 1x Jhoira of the Ghitu 1x Melek, Izzet Paragon 1x Niv-Mizzet, the Firemind 1x Nivix Cyclops 1x Psychosis Crawler 1x Talrand, Sky Summoner 1x Young Pyromancer Planeswalker (3) Land (38) Enchantment (1) Artifact (5) Instant (24) 1x Blue Sun's Zenith 1x Blustersquall 1x Brainstorm 1x Capsize 1x Chaos Warp 1x Clash of Wills 1x Counterflux 1x Counterlash 1x Counterspell 1x Cyclonic Rift 1x Dig Through Time 1x Dominate 1x Fact or Fiction 1x Izzet Charm 1x Magmaquake 1x Mana Leak 1x Mystic Confluence 1x Prophetic Bolt 1x Reiterate 1x Reverberate 1x Scatter to the Winds 1x Spell Counter 1x Steam Augury 1x Turn / Burn

Note that this is a cast trigger not an ETB one, so it won't work with tokens