mtg play top card of library lands and spells from the your with a 1 discount on artifacts in standard for 2UUUR : r/BadMtgCombos Warp World MTG - Tenth

Rule 608.2d, in turn, states (emphasis mine): 608.2d If an effect of a spell or ability offers any choices other than choices already made as part of casting the spell, activating the ability, or otherwise putting the spell or ability on the stack, the player announces these while applying the effect.Although it might be completely trivial and unnecessary to state, which half of a split card to cast is a choice (made during the casting process)

In Limited (Draft & Sealed), where you build from random packs, rarity is a rough proxy for power

Shaun's last ability will exile all Synth tokens you control, not just Synth tokens created by its first ability

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Both effects are reliant on Koglas survival, but he will continue to provide value as long as he sticks around