I know this tip is very general, but you can search for suitable signets,banners or cost-reducing cards in Gatherer or magiccardsinfo
For a lean budget, a practical plan looks like this
Magic: The Gathering's latest Secret Lair 'superdrop' has been announced, revealing several new premium boxed sets due to go live at the end of the month
Dragon Frontiers #101/101 Best of Game #8/9 Holon Phantoms #103/110 Paldean Fates #232/91 Neo Destiny #109/105 Expedition Base Set #19/165 Shining Legends #78/73 Team Rocket Returns #99/109 Pokmon Rumble #9/16 Destined Rivals #231/182 Holon Phantoms #100/110 Southern Islands #1/18 Mew is one of the most sought-after Pokemon in the trading card game, with cards spanning multiple sets and generations since the original Base Set in 1998
While these specific requirements are difficult to meet, doing so will often win you the duel
In the long run, however, these are likely to fall back to being cheaper picks