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Legality
| Format | Legality |
| 1v1 Commander | Legal |
| Alchemy | Legal |
| Arena | Legal |
| Block Constructed | Legal |
| Canadian Highlander | Legal |
| Casual | Legal |
| Commander / EDH | Legal |
| Commander: Rule 0 | Legal |
| Custom | Legal |
| Duel Commander | Legal |
| Gladiator | Legal |
| Highlander | Legal |
| Historic | Legal |
| Historic Brawl | Legal |
| Legacy | Legal |
| Leviathan | Legal |
| Limited | Legal |
| Modern | Legal |
| Modern Beyond Horizons | Legal |
| Oathbreaker | Legal |
| Pioneer | Legal |
| Planar Constructed | Legal |
| Pre-release | Legal |
| Standard | Legal |
| Standard Brawl | Legal |
| Tiny Leaders | Legal |
| Vintage | Legal |
Belligerent Yearling
Creature — Dinosaur
Trample
Whenever another Dinosaur enters the battlefield under your control, you may have Belligerent Yearling's base power become equal to that creature's power until end of turn.
EDH
0
/ 0
EDH
0
/ 0
EDH
0
/ 0
EDH
1
/ 0
STD
2
/ 0
EDH
0
/ 0
EDH
0
/ 0
EDH
2
/ 0
legendofa on “As ETB” vs. “When ETB”
8 months ago
"As X enters the battlefield" is not a triggered ability. The key words for triggered abilities are "when", "whenever" and "at".
When: Armored Kincaller
Whenever: Belligerent Yearling
At: Hulking Raptor
Anything else is not a triggered ability.