If a creature with persist that has +1/+1 counters on it receives enough -1/-1 counters to cause it to be destroyed by lethal damage or put into its owner's graveyard for having 0 or less toughness, persist won't trigger and the card won't return to the battlefield
If you control it when a player draws their second card in a turn, that ability will trigger
The Frog has a smaller body at 1/1, but it can block flyers with reach and then give it deathtouch with 2 mana so if you have it untapped and ready, people might avoid attacking you with grounded or flying stuff too in order to not trade down with a 2 mana 1/1
Perhaps the most obvious combination with Jumbo Cactuar is Fling, which lets you sacrifice a creature to deal damage equal to its power to any target
It means a great deal to him, and he is rarely seen without it
Ringsight Ringsight is a 3-mana tutor with conditions, but if youre in these colors, do you want another Grim Tutor cost tutor