Alexios, Deimos of Kosmos 

Legendary Creature — Human Berserker
Trample
Alexios attacks each combat if able, can't be sacrificed, and can't attack its owner.
At the beginning of each player's upkeep, that player gains control of Alexios, untaps it, and puts a +1/+1 counter on it. It gains haste until end of turn.
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Xantcha, Sleeper Agent 94%
$1.41#3008
"this card attacks each combat if able and can't attack its owner or planeswalkers its owner controls."
Pipsqueak, Rebel Strongarm 87%
$0.20#26567
"this card can't attack alone unless he has a +1/+1 counter on him."
Shauku, Endbringer 86%
$2.34#20586
"this card can't attack if there's another creature on the battlefield."
Champions of Minas Tirith 86%
$0.32#5273
"At the beginning of combat on each opponent's turn, if you're the monarch, that opponent may pay {X}, where X is the number of cards in their hand. If they don't, they can't attack you this combat."
Web of Inertia 84%
$0.75#11836
"At the beginning of combat on each opponent's turn, that player may exile a card from their graveyard. If the player doesn't, creatures they control can't attack you this turn."
Zhou Yu, Chief Commander 83%
$150.00#29261
"this card can't attack unless defending player controls an Island."
Willie Lumpkin, Postman 83%
$1.35#18200
"Whenever this card deals combat damage to an opponent, you draw a card and that player may draw a card. If they do, that player can't attack you or permanents you control during their next turn."
Unstable Glyphbridge // Sandswirl Wanderglyph 82%
$0.29#8137
"Whenever an opponent casts a spell during their turn, they can't attack you or planeswalkers you control this turn."
Overencumbered 82%
$0.34#10579
"At the beginning of combat on enchanted opponent's turn, that player may pay {1} for each artifact they control. If they don't, creatures can't attack this combat."
Steel Dromedary 82%
$0.15#23100
"This creature doesn't untap during your untap step if it has a +1/+1 counter on it."
Kratos, God of War 82%
$53.91#6533
"At the beginning of each player's end step, this card deals damage to that player equal to the number of creatures that player controls that didn't attack this turn."
Fealty to the Realm 81%
$0.24#10407
"Enchanted creature attacks each combat if able and can't attack you."
Karona, False God 81%
$3.68#13514
"At the beginning of each player's upkeep, that player untaps this card and gains control of it."
Halls of Mist 81%
$3.40#19884
"Creatures that attacked during their controller's last turn can't attack."
Ivorytusk Fortress 81%
$0.29#17324
"Untap each creature you control with a +1/+1 counter on it during each other player's untap step."
The Second Doctor 81%
$0.47#3825
"At the beginning of your end step, each player may draw a card. Each opponent who does can't attack you or permanents you control during their next turn."
Oriss, Samite Guardian 80%
$0.86#24485
"Discard another card named this card: Target player can't cast spells this turn, and creatures that player controls can't attack this turn."