It's also just been a big part of cyberpunk in general
Emberheart Challenger also has the Valiant ability, which states that whenever it's targeted by a spell or ability you control for the first time in a turn, you exile the top card of your library and can cast it until the end of that turn
Many Allies reward you with some kind of trigger whenever they or another Ally enters, and what better way to take advantage of these effects than by doubling them
The drawback is that its sorcery speed, so you cant activate it during combat, which is when the creature will come back with the counter
Most summons in Final Fantasy have three chapters like Fenrir, so always remember the 2 blocks 1 attack rule
Add in the synergy with classic Elf mana engines and youve got one of the best Elf commanders in MTG for aggressive, combat-focused builds