Dreamstalker Manticore
Enchantment Creature — Manticore
Whenever you cast your first spell during each opponent's turn, this creature deals 1 damage to any target.
Purphoros forged the manticore's tail from bronze, its teeth from silver, and its heart from hate.
Chris Rallis
Theros Beyond Death (THB)
• #131Rulings
In a Two-Headed Giant game, this ability triggers no more than once during each opposing team’s turn.
(wotc • 2020-01-24)
If you have more than one opponent, this ability can trigger once during each of those opponents’ turns.
(wotc • 2020-01-24)
This ability triggers only on your very first spell during an opponent’s turn, not the first spell after the card is on the battlefield. If you cast a spell before it’s on the battlefield (including if you cast this card somehow during an opponent’s turn), the ability won’t trigger.
(wotc • 2020-01-24)
An ability that triggers when you cast a spell resolves before the spell that caused it to trigger. It resolves even if that spell is countered.
(wotc • 2020-01-24)
Rulings
In a Two-Headed Giant game, this ability triggers no more than once during each opposing team’s turn.
(wotc • 2020-01-24)
If you have more than one opponent, this ability can trigger once during each of those opponents’ turns.
(wotc • 2020-01-24)
This ability triggers only on your very first spell during an opponent’s turn, not the first spell after the card is on the battlefield. If you cast a spell before it’s on the battlefield (including if you cast this card somehow during an opponent’s turn), the ability won’t trigger.
(wotc • 2020-01-24)
An ability that triggers when you cast a spell resolves before the spell that caused it to trigger. It resolves even if that spell is countered.
(wotc • 2020-01-24)