High Troller — ruling 1

A spell or ability is targeted if it has one or more targets.

High Troller — ruling 2

If a spell or ability has “any number” of targets or “up to” a given number of targets, first its controller choses how many targets it has. If that number is greater than zero, the targets are chosen randomly.

High Troller — ruling 3

A triggered ability won’t cost less, since there isn’t a triggering cost to reduce, but its targets will be chosen randomly.

High Troller — ruling 4

Targets are chosen only from among legal targets.

High Troller — ruling 5

If a spell or ability has two or more targets where the legality of one or more of those targets depends on what one or more of the other targets are, the targets are chosen at random in the order specified on the card. If choosing one player or object as a target would cause no legal targets to remain for another target, that player or object can’t be randomly chosen.

High Troller — ruling 6

Targeted spells and abilities cost only {2} less, even if they have more than one target.

High Troller — ruling 7

One a spell or ability has had random targets chosen, a player can’t choose to not finish casting or activating that spell or ability unless there’s no way for the player to complete the process. For example, the player can’t choose to not activate mana abilities to pay for the spell.

High Troller : règles, fonctionnement et interactions (MTG)

High Troller is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

All targeted spells and abilities cost less and have their targets chosen randomly.

How it works : High Troller

Original English text — Wizards of the Coast / Scryfall

#1November 12, 2019· Wizards of the Coast
A spell or ability is targeted if it has one or more targets.
No other card is named in this ruling.
#2November 12, 2019· Wizards of the Coast
If a spell or ability has “any number” of targets or “up to” a given number of targets, first its controller choses how many targets it has. If that number is greater than zero, the targets are chosen randomly.
No other card is named in this ruling.
#3November 12, 2019· Wizards of the Coast
A triggered ability won’t cost less, since there isn’t a triggering cost to reduce, but its targets will be chosen randomly.
No other card is named in this ruling.
#4November 12, 2019· Wizards of the Coast
Targets are chosen only from among legal targets.
No other card is named in this ruling.
#5November 12, 2019· Wizards of the Coast
If a spell or ability has two or more targets where the legality of one or more of those targets depends on what one or more of the other targets are, the targets are chosen at random in the order specified on the card. If choosing one player or object as a target would cause no legal targets to remain for another target, that player or object can’t be randomly chosen.
No other card is named in this ruling.
#6November 12, 2019· Wizards of the Coast
Targeted spells and abilities cost only less, even if they have more than one target.
No other card is named in this ruling.
#7November 12, 2019· Wizards of the Coast
One a spell or ability has had random targets chosen, a player can’t choose to not finish casting or activating that spell or ability unless there’s no way for the player to complete the process. For example, the player can’t choose to not activate mana abilities to pay for the spell.
No other card is named in this ruling.