Xolatoyac, the Smiling Flood 
Legendary Creature — Salamander Serpent
$0.46 #5126 0.50 2.9 years
Whenever Xolatoyac enters or attacks, put a flood counter on target land. That land is an Island in addition to its other types for as long as it has a flood counter on it.
At the beginning of your end step, untap each permanent you control with a counter on it.
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Cards similar to Xolatoyac, the Smiling Flood 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.
Eluge, the Shoreless Sea88%
$4.42↑#3149↑0.71↑2.2 years
"Whenever this card enters or attacks, put a flood counter on target land. It's an Island in addition to its other types for as long as it has a flood counter on it."
Aquitect's Will78%
$0.31↓#7027↓0.07↓19.0 years↑
"Put a flood counter on target land. That land is an Island in addition to its other types for as long as it has a flood counter on it. If you control a Merfolk, draw a card."
The Flood of Mars76%
$0.37↓#8866↓0.18↓3.0 years
"Whenever this creature attacks, put a flood counter on another target creature or land. If it's a creature, it becomes a copy of this creature. If it's a land, it becomes an Island in addition to its other types."
Kiora's Follower74%
$0.31↓#1610↑0.33↓12.7 years↑
"
: Untap another target permanent."
: Untap another target permanent."
Seedborn Muse74%
$16.09↑#286↑1.80↑23.7 years↑
"Untap all permanents you control during each other player's untap step."
Omo, Queen of Vesuva74%
$0.18↓#51850.412.3 years
"Whenever this card enters or attacks, put an everything counter on each of up to one target land and up to one target creature."
Ioreth of the Healing House72%
$0.36↓#2420↑0.34↓3.3 years
": Untap another target permanent."
: Untap another target permanent."
Quicksilver Fountain72%
$3.65↑#13681↓0.74↑23.0 years↑
"At the beginning of each player's upkeep, that player puts a flood counter on target non-Island land they control of their choice. That land is an Island for as long as it has a flood counter on it."
Unbender Tine72%
$0.25↓#16319↓0.06↓17.5 years↑
": Untap another target permanent."
: Untap another target permanent."
Nimbleclaw Adept72%
$0.18↓#9164↓0.22↓4.4 years↑
": Untap two other target permanents. Activate only as a sorcery and only once each turn."
: Untap two other target permanents. Activate only as a sorcery and only once each turn."
Forensic Researcher71%
$0.29↓#8194↓0.27↓2.7 years
": Untap another target permanent you control."
: Untap another target permanent you control."
Vizier of Tumbling Sands71%
$0.20↓#3434↑0.22↓9.5 years↑
": Untap another target permanent."
: Untap another target permanent."
Cacophodon71%
$0.21↓#10902↓0.18↓8.8 years↑
"Whenever this creature is dealt damage, untap target permanent."
North Pole Patrol70%
$0.22↓#8548↓0.24↓0.9 years↓
": Untap another target permanent you control."
: Untap another target permanent you control."
Nanoform Sentinel70%
$0.16↓#12168↓0.00↓1.2 years↓
"Whenever this creature becomes tapped, untap another target permanent. This ability triggers only once each turn."
Kelpie Guide70%
$0.24↓#47230.06↓5.5 years↑
": Untap another target permanent you control."
: Untap another target permanent you control."