Captain Hook, Forceful Duelist is a decent card that costs just 1 Ink to get into play, but you can also use him in your Inkwell as a resource too, if you choose to

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Duelists Heritage can target opponents creatures, helping you shred life totals even quicker
If that werent enough, you can also take advantage of a powerful Peter Pan card that gains lore for you whenever it moves to a location
As a zero mana spell that is instant you can do a lot of things your opponent wasn't accounting for, perhaps it is just for fixing, they assumed you couldn't play a Cryptic Command due to lack of triple blue but the Search sorts it out etc
When an ability affects more than one player, the players take it in turns to trigger its effects, starting with the current player and proceeding clockwise (so the person to your left goes after you)