Notorious Throng - [Foil] Morningtide (MOR) DMC sacrifice it unless you return

sacrifice it unless you return an untapped Forest you control to its owner's hand

where X is Esper Sentinel's power

rounded down

Tarmogoyf's power is equal to the number of card types among cards in all graveyards and its toughness is equal to that number plus 1

but someone else had developed a keen interest in them

Notorious Throng - [Foil] Morningtide (MOR) DMC sacrifice it unless you returnProwl {5}{U} (You may cast this for its prowl cost if you dealt combat damage to a player this turn with a Rogue.) Create X 1 1 black Faerie Rogue creature tokens with flying, where X is the damage dealt to your opponents this turn. If this spell's prowl cost was paid, take an extra turn after this one.