Grothama, All-Devouring 


Legendary Creature — Wurm
Other creatures have "Whenever this creature attacks, you may have it fight Grothama, All-Devouring."
When Grothama leaves the battlefield, each player draws cards equal to the amount of damage dealt to Grothama this turn by sources they controlled.
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Siege Behemoth 83%
$7.67#8600
"As long as this creature is attacking, for each creature you control, you may have that creature assign its combat damage as though it weren't blocked."
Canal Courier 83%
$0.14#23657
"Whenever this creature and another creature attack different players, this creature can't be blocked this combat."
Imperious Mindbreaker 83%
$0.37#14266
"As long as this card is paired with another creature, each of those creatures has "Whenever this creature attacks, each opponent mills cards equal to its toughness.""
Ekundu Cyclops 82%
$0.11#30718
"If a creature you control attacks, this creature also attacks if able."
Preeminent Captain 82%
$0.72#9402
"Whenever this creature attacks, you may put a Soldier creature card from your hand onto the battlefield tapped and attacking."
Reckless Cohort 81%
$0.03#29476
"This creature attacks each combat if able unless you control another Ally."
Tahngarth, First Mate 81%
$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."
Smirking Spelljacker 81%
$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."
Shadowfax, Lord of Horses 81%
$0.24#12618
"Whenever this card attacks, you may put a creature card with lesser power from your hand onto the battlefield tapped and attacking."
Gaea's Courser 81%
$0.04#24471
"Whenever this creature attacks, if there are three or more creature cards in your graveyard, draw a card."
Redoubled Stormsinger 80%
$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."
Minion of the Mighty 80%
$1.36#6131
"Whenever this creature attacks, if you attacked with creatures with total power 6 or greater this combat, you may put a Dragon creature card from your hand onto the battlefield tapped and attacking."
Sunfrill Imitator 80%
$0.80#3713
"Whenever this creature attacks, you may have it become a copy of another target Dinosaur you control, except its name is this card and it has this ability."
Mirror-Style Master 80%
$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."