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Archmage of Runes Archmage Emeritus is a blue staple in spellslinger decks, and shaving off a mana from instants and sorceries is also something these decks are interested in doing

Add to that the shift cost to get Elsa in two turns earlier, and you can see why she froze out the competition for so long

Combine it with cards that eliminate your hand size limit and some kind of evasion for maximum effect.

After changes were made to planeswalkers to make them all legendary, you cannot run more than one Jace Beleren or other cards due to their legendary status, not due to any special rules, an you could now have multiple Jaces like Jace, Memory Adapt and Jace Belerenas long as they were different Jaces