Contested Game Ball 
Artifact
$0.21 #16198 0.28 2.8 years
Whenever you're dealt combat damage, the attacking player gains control of this artifact and untaps it.
, 
: Draw a card and put a point counter on this artifact. Then if it has five or more point counters on it, sacrifice it and create a Treasure token.Click a line or tag to filter
Cards similar to Contested Game Ball expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Crag Saurian78%
$0.45↑#28873↓0.3326.9 years↑
"Whenever a source deals damage to this creature, that source's controller gains control of this creature."
Contested War Zone76%
$0.30↑#146190.07↓15.6 years↑
"Whenever a creature deals combat damage to you, that creature's controller gains control of this land."
Karona, False God75%
$3.98↑#138040.2123.3 years↑
"At the beginning of each player's upkeep, that player untaps this card and gains control of it."
Sunset Pyramid73%
$0.09↓#189250.299.1 years↑
", , Remove a brick counter from this artifact: Draw a card."
, , Remove a brick counter from this artifact: Draw a card."
Tome of Legends72%
$0.30↑#2279↑0.196.9 years↑
"
, , Remove a page counter from this artifact: Draw a card."
, , Remove a page counter from this artifact: Draw a card."
Pendant of Prosperity72%
$0.65↑#5201↑0.277.0 years↑
"This artifact enters under the control of an opponent of your choice."
+1 more matching line
Dragon's Hoard72%
$0.44↑#1194↑0.06↓8.1 years↑
", Remove a gold counter from this artifact: Draw a card."
, Remove a gold counter from this artifact: Draw a card."
Insight Engine72%
$1.18↑#2502↑0.231.1 years↓
", : Put a charge counter on this artifact, then draw a card for each charge counter on it."
, : Put a charge counter on this artifact, then draw a card for each charge counter on it."
Trigon of Thought70%
$0.09↓#29345↓0.2715.9 years↑
", , Remove a charge counter from this artifact: Draw a card."
, , Remove a charge counter from this artifact: Draw a card."
Tablet of Compleation70%
$0.19↓#131860.223.6 years
", : Draw a card. Activate only if this artifact has five or more oil counters on it."
, : Draw a card. Activate only if this artifact has five or more oil counters on it."
Scepter of Insight70%
$0.17↓#29937↓0.00↓17.6 years↑
"
, : Draw a card."
, : Draw a card."
Coveted Jewel70%
$0.27↑#1270↑0.57↑8.1 years↑
"Whenever one or more creatures an opponent controls attack you and aren't blocked, that player draws three cards and gains control of this artifact. Untap it."
Urza's Blueprints70%
$0.16↓#23313↓0.12↓27.6 years↑
": Draw a card."
: Draw a card."
Diary of Dreams70%
$0.30↑#10367↑0.00↓0.4 years↓
"
, : Draw a card. This ability costs less to activate for each page counter on this artifact."
, : Draw a card. This ability costs less to activate for each page counter on this artifact."
Staff of the Storyteller70%
$0.43↑#3129↑0.17↓3.6 years
"
, , Remove a story counter from this artifact: Draw a card."
, , Remove a story counter from this artifact: Draw a card."
Staff of Domination70%
$10.66↑#1037↑0.82↑22.3 years↑
", : Draw a card."
, : Draw a card."+1 more matching line
Arcane Encyclopedia70%
$0.17↓#11063↑0.00↓8.1 years↑
", : Draw a card."
, : Draw a card."
Slicer, Hired Muscle // Slicer, High-Speed Antagonist70%
$9.32↑#3411↑0.96↑3.8 years
"At the beginning of each opponent's upkeep, you may have that player gain control of this card until end of turn. If you do, untap this card, goad it, and it can't be sacrificed this turn. If you don't, convert it."