Drover of the Mighty — ruling 1

Because damage remains marked on a creature until it's removed as the turn ends, the damage Drover of the Mighty takes during combat may become lethal if you no longer control a Dinosaur later in the turn.

Drover of the Mighty : règles, fonctionnement et interactions (MTG)

Drover of the Mighty 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

This creature gets +2/+2 as long as you control a Dinosaur. : Add one mana of any color.

How it works : Drover of the Mighty

Original English text — Wizards of the Coast / Scryfall

#1September 29, 2017· Wizards of the Coast
Because damage remains marked on a creature until it's removed as the turn ends, the damage Drover of the Mighty takes during combat may become lethal if you no longer control a Dinosaur later in the turn.
No other card is named in this ruling.