mtg artifact card draw Thirst for Knowledge - Planechase #14 (English) Rules Text: enters, the, battlefield,

As well as this, we can count on recent "nostalgia" sets like Tarkir: Dragonstorm having brought longtime players back into the fold to see fresh takes on old characters, game mechanics and settings

That gives her five distant abilities that you can use

Ikoria: Lair of Behemoths

1 Ranging Raptors

It's worth noting that generic ETB doublers like Starfield VocalistStarfield Vocalist and PanharmoniconPanharmonicon will double the discovery triggers, but creature type-dependent doublers, like Katara and Roaming ThroneRoaming Throne, will not

Also, there's Orochi Soul-Reaver , a 5/4 Snake Ninja Rogue that can be ninjutsued in for 4 instead of its normal 6 mana and provides a very good combat damage trigger for both commanders: Whenever one or more creatures you control deal combat damage to a player, you create a treasure token and manifest the top card of that player's library