Aspiring Champion 

Creature — Astartes Warrior
Menace
Ruinous Ascension — When this creature deals combat damage to a player, sacrifice it. If you do, reveal cards from the top of your library until you reveal a creature card. Put that card onto the battlefield, then shuffle the rest into your library. If that creature is a Demon, it deals damage equal to its power to each opponent.
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Cacophony Scamp 93%
$0.28#11681
"Whenever this creature deals combat damage to a player, you may sacrifice it. If you do, proliferate."
Haunted Cadaver 92%
$0.12#27339
"Whenever this creature deals combat damage to a player, you may sacrifice it. If you do, that player discards three cards."
Furnace Scamp 90%
$0.10#26500
"Whenever this creature deals combat damage to a player, you may sacrifice it. If you do, this creature deals 3 damage to that player."
Living Lore 90%
$0.10#23263
"Whenever this creature deals combat damage, you may sacrifice it. If you do, you may cast the exiled card without paying its mana cost."
Demon of Loathing 90%
$0.46#8186
"Whenever this creature deals combat damage to a player, that player sacrifices a creature of their choice."
Cabal Executioner 90%
$0.21#25603
"Whenever this creature deals combat damage to a player, that player sacrifices a creature of their choice."
Servant of the Stinger 87%
$0.22#10122
"Whenever this creature deals combat damage to a player, if you've committed a crime this turn, you may sacrifice this creature. If you do, search your library for a card, put it into your hand, then shuffle."
Greater Harvester 85%
$1.71#13056
"Whenever this creature deals combat damage to a player, that player sacrifices two permanents of their choice."
Riptide Entrancer 84%
$1.41#17917
"Whenever this creature deals combat damage to a player, you may sacrifice it. If you do, gain control of target creature that player controls."
Akki Underminer 84%
$0.15#22722
"Whenever this creature deals combat damage to a player, that player sacrifices a permanent of their choice."
The Gitrog, Ravenous Ride 82%
$4.27#4146
"Whenever this card deals combat damage to a player, you may sacrifice a creature that saddled it this turn. If you do, draw X cards, then put up to X land cards from your hand onto the battlefield tapped, where X is the sacrificed creature's power."
Whispering Specter 82%
$2.58#11615
"Whenever this creature deals combat damage to a player, you may sacrifice it. If you do, that player discards a card for each poison counter they have."
Witch-king of Angmar 82%
$8.19#2809
"Whenever one or more creatures deal combat damage to you, each opponent sacrifices a creature of their choice that dealt combat damage to you this turn. The Ring tempts you."
Impaler Shrike 81%
$0.11#19839
"Whenever this creature deals combat damage to a player, you may sacrifice it. If you do, draw three cards."
Foot Chopper 81%
$0.29#13178
"Whenever equipped creature deals combat damage to a player, you may sacrifice it. If you do, draw cards equal to its power."
Dauthi Mindripper 81%
$0.26#22949
"Whenever this creature attacks and isn't blocked, you may sacrifice it. If you do, defending player discards three cards."