"Until this expedition is done, that blade is your guardian, your liberator, and your best friend all rolled into one." —Yon Basrel, Oran-Rief survivalist
When Tsabo's Web enters the battlefield, draw a card. Each land with an activated ability that isn't a mana ability doesn't untap during its controller's untap step.
Players play a subgame starting at 5 life and with up to three permanent cards with different names from their main-game library on the battlefield. As the subgame ends, the winner chooses one of the cards they put onto the battlefield as the subgame began and puts it onto the battlefield rather than shuffling it into their library.
Whenever Tuktuk Scrapper or another Ally enters the battlefield under your control, you may destroy target artifact. If that artifact is put into a graveyard this way, Tuktuk Scrapper deals damage to that artifact's controller equal to the number of Allies you control.
Tumble Magnet enters the battlefield with three charge counters on it. {T}, Remove a charge counter from Tumble Magnet: Tap target artifact or creature.
Magnetic devices that keep massive golems and structures standing can also be used for the opposite purpose.
Tundra Fumarole deals 4 damage to target creature or planeswalker. Add {C} for each {S} spent to cast this spell. Until end of turn, you don't lose this mana as steps and phases end.
The only thing that smells worse than troll is burnt troll.
Whenever a land enters the battlefield under an opponent's control, if that player had another land enter the battlefield under their control this turn, Tunnel Ignus deals 3 damage to that player.
At the beginning of your end step, if a face-down creature entered the battlefield under your control this turn, put a +1/+1 counter on Tunnel Tipster. {T}: Add {G}.
"When your perp goes underground, I know where to find 'em."
Visit — Choose an opponent. They choose a creature they control, then you choose a creature you control. You may exile the chosen creatures. If you do, return them to the battlefield under their owners' control at the beginning of the next end step. Otherwise, the chosen creatures fight each other.
When Turf War enters the battlefield, for each player, put a contested counter on target land that player controls. Whenever a creature deals combat damage to a player, if that player controls one or more lands with contested counters on them, that creature's controller gains control of one of those lands of their choice and untaps it.