Pouncing Jaguar [Arena League 1999] Dragon's Maze Promos it gets +1/+1 and has

it gets +1/+1 and has "Whenever this creature deals damage to an opponent

you may search your library for up to two land cards

Set: Urza's Legacy Type: Legendary Creature — Angel Rarity: Rare Cost: {3}{W}{W} Flying

then repeats this process until a creature card or X cards have been put into their graveyard this way

Set: Commander 2016 Type: Enchantment Rare Cost: {4}{G}{G} Whenever an opponent casts a spell

Pouncing Jaguar [Arena League 1999] Dragon's Maze Promos it gets +1/+1 and hasSet: Arena League 1999 Type: Creature Cat Rare Cost: {G} Echo {G} (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.) One pounce, she's hungryyou die quickly. Two, she's teaching her cubsyou're in for a long day.