There are cards with infect in all four of the creatures colors, making it easy to incorporate them as well as creatures with toxic for a formidable poison counters deck build
I highly recommend starting with one of these: Solemn SimulacrumSolemn Simulacrum, Skyclave ApparitionSkyclave Apparition, and Whirler VirtuosoWhirler Virtuoso
On PTCGO, it is possible to build a huge collection from nothing with the trading system, however it is widely considered to not be intuitive or beginner friendly
With protection from red and white, this card can be difficult for certain decks to remove or block
The best place to buy Japanese Pokmon cards can guarantee authentic products, avoiding the dreaded risk of Pokmon fake cards while also providing competitive prices that wont break the bank
The Reaper's ScytheReaper's Scythe is deceptively easy to stack with counters