Typhoon 
Sorcery
$19.47 #30103 0.21 32.4 years
Typhoon deals damage to each opponent equal to the number of Islands that player controls.
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Cards similar to Typhoon 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.
Monsoon87%
$0.95↓#274210.62↑31.4 years↓
"At the beginning of each player's end step, tap all untapped Islands that player controls and this enchantment deals X damage to the player, where X is the number of Islands tapped this way."
Scald82%
$0.29↓#257311.12↑28.0 years↓
"Whenever a player taps an Island for mana, this enchantment deals 1 damage to that player."
Cryoclasm81%
$0.16↓#280230.59↑20.2 years↓
"Destroy target Plains or Island. this card deals 3 damage to that land's controller."
Water Wurm80%
$0.23↓#315740.00↓32.2 years
"This creature gets +0/+1 as long as an opponent controls an Island."
Wu Admiral80%
$2.39↓#313470.2527.5 years↓
"This creature gets +1/+1 as long as an opponent controls an Island."
Boil76%
$0.64↓#15053↑1.89↑29.0 years↓
"Destroy all Islands."
Boiling Seas76%
$4.95↓#20408↑1.92↑29.5 years↓
"Destroy all Islands."
Tsunami76%
$0.35↓#19248↑2.00↑33.2 years
"Destroy all Islands."
Carpet of Flowers75%
$1.75↓#1335↑0.52↑28.0 years↓
"At the beginning of each of your main phases, if you haven't added mana with this ability this turn, you may add X mana of any one color, where X is the number of Islands target opponent controls."
Sizzle72%
$0.21↓#15982↑0.06↓27.0 years↓
"this card deals 3 damage to each opponent."
Breath of Malfegor72%
$0.18↓#13956↑0.1217.5 years↓
"this card deals 5 damage to each opponent."
Thoughtleech72%
$0.22↓#250830.36↑31.4 years↓
"Whenever an Island an opponent controls becomes tapped, you may gain 1 life."
Tide Shaper72%
$0.25↓#11664↑0.115.3 years↓
"This creature gets +1/+1 as long as an opponent controls an Island."
Choke71%
$0.86↓#17577↑1.76↑29.0 years↓
"Islands don't untap during their controllers' untap steps."
Rushwood Legate71%
$0.23↓#300520.2127.0 years↓
"If an opponent controls an Island and you control a Forest, you may cast this spell without paying its mana cost."
Curse of Marit Lage70%
$2.66↓#258381.32↑31.4 years↓
"Islands don't untap during their controllers' untap steps."