There are set symbols, copyright dates, and all sorts of information that make it clear where a card came from
But if you're empty-handed and destroy their Swamp, they're forced to playing a blank if they want to progress their plan
Yes, these sets are worth it as they contain various meta-relevant cards for competitive players, a large selection of rare and unique special art cards to collect, and several valuable chase cards to entice investors to buy the stock.
The app does an awful lot of hard work for you, but it means you dont have that tactile experience of tucking your Energy card under your active Pokmon, or placing the damage counters on your monster when attacked
Drain Life Drain Power Drain the Well Draining Whelk Drainpipe Vermin Ego Drain Essence Drain Invasion of Eldraine Mana Drain Memory Drain Mind Drain Psychic Drain Spelldrain Assassin Throne of Eldraine
Anthems like Death Baron are removal magnets and do nothing alone build a board first, then pump it