Calamity, Galloping Inferno 


Legendary Creature — Horse Mount
Haste
Whenever Calamity attacks while saddled, choose a nonlegendary creature that saddled it this turn and create a tapped and attacking token that's a copy of it. Sacrifice that token at the beginning of the next end step. Repeat this process once.
Saddle 1
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Cards that do something similar expected a card that isn't here?
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Shredder, Shadow Master 89%
$0.94#6431
"Whenever this card attacks a player, for each other opponent, create a token that's a copy of this card tapped and attacking that player, except it isn't legendary. Sacrifice those tokens at end of combat."
Ma Chao, Western Warrior 86%
$80.20#26861
"Whenever this card attacks alone, it can't be blocked this combat."
Mardu Siegebreaker 83%
$0.46#3889
"Whenever this creature attacks, for each opponent, create a tapped token that's a copy of the exiled card attacking that opponent. At the beginning of your next end step, sacrifice those tokens."
Fire Lord Azula 83%
$1.66#3905
"Whenever you cast a spell while this card is attacking, copy that spell. You may choose new targets for the copy."
Tahngarth, First Mate 82%
$0.23#15357
"Whenever an opponent attacks with one or more creatures, if this card is tapped, you may have that opponent gain control of this card until end of combat. If you do, choose a player or planeswalker that opponent is attacking. this card is attacking that player or planeswalker."
Phantom Steed 82%
$0.44#11066
"Whenever this creature attacks, create a tapped and attacking token that's a copy of the exiled card, except it's an Illusion in addition to its other types. Sacrifice that token at end of combat."
Mirror-Style Master 81%
$0.27#12093
"Whenever this creature attacks, for each attacking modified creature you control, create a tapped and attacking token that's a copy of that creature. Exile those tokens at end of combat."
+1 more matching line
Redoubled Stormsinger 81%
$0.25#3402
"Whenever this creature attacks, for each creature token you control that entered this turn, create a tapped and attacking token that's a copy of that token. At the beginning of the next end step, sacrifice those tokens."
Veronica, Dissident Scribe 80%
$0.34#8598
"Whenever this card attacks, you may discard a card. If you do, draw a card."
Smirking Spelljacker 80%
$2.79#6873
"Whenever this creature attacks, if a card is exiled with it, you may cast the exiled card without paying its mana cost."
Ophidian 80%
$0.43#26493
"Whenever this creature attacks and isn't blocked, you may draw a card. If you do, this creature assigns no combat damage this turn."