Her +2 to make three mana and exile the top cards and cast one is great mana making and card draw in one card and ability, many of her 'walkers do both, but not on the same ability
their card is Selvala, Heart of the Wilds, a 2/3 Legendary Elf Scout
This ability will give you an advantage as your opponent will repeatedly try to remove this, exhausting their resources in trying to do so It can also bring back your threats from the graveyard with its ability
Wasitori, Nekoru Queen If you arent going full five-colored or mono-red, Jund is the color combo you want for a dragons deck
The incremental advantage it earns is absolutely bewildering, and it can easily take over a game after a single trade, removal spell, or combat trick