For example, Blue can be used if you want to focus on countering spells (creatures, sorcery, etc) and draw cards quickly
Its few efficient, reusable options depend on synergy with specific card types (Mesa Enchantress, Puresteel Paladin), and as such, many mono-white decks (Sram, Senior Edificer, Teshar, Ancestors Apostle) start by committing to a focus on one such package of synergies
This Thunderbond Vanguard card would be excellent in a deck that focuses on creating a wide board presence with multiple creatures, such as a token-based strategy or a tribal deck with many creature types
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Your opponents always have the option to discard, thus you should expect them to make that choice most of the time, as the idea of whatever construct, robot, or vehicle coming down for free will scare your opponent
Elementals can get pretty pricey, so 5 mana is often a cost reduction, and at instant speed, you can pull a lot of surprises outside your turn
