While I was able to get six cards exiled with Ixhel during our test game, I wouldnt count it as strict card advantage because: (A) its other peoples decks, so many of the cards wont actually be useful to us, and (B) most of the cards exiled were lands
There are a few important things that come into play: The set and card number (located at the bottom right of the card) The rarity (common, rare, holo, secret rare, etc.) The condition (Near Mint, Light Play, Damaged) Is the card graded
Fate Transfer, however, cant target planeswalkers at all

Acclaimed Contender Accorder Paladin Adelbert Steiner Adeline, Resplendent Cathar Adeline, Resplendent Cathar Adriana, Captain of the Guard Adun Oakenshield Agatha's Champion Agent of Stromgald Alaborn Cavalier Alaborn Veteran Angelfire Crusader Ardenvale Paladin Ardenvale Tactician Argivian Cavalier Armored Skyhunter Armored Wolf-Rider Armory Paladin Arna Kennerd, Skycaptain Arrogant Bloodlord Arthur, Marigold Knight Arvad the Cursed Aryel, Knight of Windgrace Ashenmoor Liege Attended Knight Ayara's Oathsworn Aysen Crusader Azorius Knight-Arbiter Azorius Skyguard Balan, Wandering Knight Bartolom del Presidio Basri's Lieutenant Basri, Tomorrow's Champion Battle Angels of Tyr Beastrider Vanguard Belle of the Brawl Benalish Cavalry Benalish Honor Guard Benalish Knight Benalish Lancer Benalish Marshal Besotted Knight Black Knight Blacklance Paragon Blazing Blade Askari Blood Knight Blood-Cursed Knight Bloodcrazed Paladin Bloodcrusher of Khorne Bloodsworn Knight Bloodsworn Steward Bloodthirsty Conqueror Boartusk Liege Bogardan Lancer Bold Impaler Border Guardian Breathless Knight Bristlebane Outrider Broodguard Elite Burning Shield Askari Burning Sun Cavalry Burning-Yard Trainer Cabal Paladin Cadaverous Knight Candlelit Cavalry Capashen Knight Capashen Templar Caradora, Heart of Alacria Caravan Escort Cavalier of Dawn Cavalier of Flame Cavalier of Gales

The only trouble with Elvish Refueler is how vulnerable it is to removal, making it a prime target for an enemy spell