This is a delayed triggered ability, and it can be countered by effects that counter triggered abilities
Gamble This is definitely one of the strongest red cards and one of the best tutors in the game
A 1/1 for three mana with protection from white and black, Animar gains a +1/+1 counter whenever you cast a creature, reducing the cost of creatures you cast by an amount of mana equal to the number of counters on it
If this creature dies before a turn's end step (for example, during combat), it will be returned to its owner's hand at the beginning of that turn's end step.
(2023-06-16) If you only have one card in your library as Gollum, Scheming Guide's ability resolves, you'll look at that card, put it back on top of your library, and then continue with the ability as normal
1 Mirrorweave